必要时填上for.1.He is very ill.No one is allowed to enter ____his

kf_52013142022-10-04 11:39:544条回答

必要时填上for.
1.He is very ill.No one is allowed to enter ____his room.2.Will you enter ____this week's crossword competition?3.Many athletes have entered ___the Olympic Games this year.4.No one saw the thief when he entered ___the building.5.I have entered ___ the examination but I don't want to take it.

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wanglaohan89 共回答了16个问题 | 采纳率100%: 1不填原因：enter=go into 所以enter是及物动词不用加for或者其它介词2for 原因 enter for是报名参加的意思3for 原因同24不填原因同15for 同2; 1年前

海浪飘云共回答了20个问题 | 采纳率80%: 1. He is very ill. No one is allowed to enter ____his room.2. Will you enter _for___this week's crossword competition?3. Many athletes have entered _for__the Olympic Games this year.4. No one saw the thief when he entered ___the building.5. I have entered _for__ the examination but I don't want to take it.; 1年前

落日楼主共回答了19个问题 | 采纳率89.5%: 2和5填 for 必要 enter for 一般和 enter差不多少; 1年前

摘星人070501 共回答了19个问题 | 采纳率73.7%: 不填FORFORFORenter for
报名参加; 1年前

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5.副词修饰动词，故quiet需用动词形式quietly。
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过去时的时候应该要换的吧.

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解题思路：（1）实验室制氧气的方法有三种，若要用加热固体的方法制氧气的话，试管口要略向下倾斜，防止试管中的冷凝水倒流，试管炸裂．若要用固液在常温下反应的方法制取氧气的话，试管要竖直放置，否则液体会流出来．要收集一瓶干燥的气体，应先干燥再收集，这里的干燥剂可用浓硫酸．
（2）李明同学的方案可行不可行，主要取决于发生装置和收集装置是否符合．
（1）若要用加热高锰酸钾或加热氯酸钾与二氧化锰的混合物制取氧气的话，a试管口要略向下倾斜，否则加热时试管中的冷凝水倒流，会造成试管炸裂．若要用分解过氧化氢溶液的方法制取氧气的活，a试管要竖直放置．否则液体药品会流出来．要收集一瓶干燥的气体应先干燥再收集，b中的干燥剂为液体，那就是浓硫酸．
故选A试管口要略向下倾斜或a试管要竖直放置
2KMnO₄

△
.
K₂MnO₄+MnO₂+O₂↑或2H₂O₂

MnO2
.
2H₂O+O₂↑（这两个空一定要对应）浓硫酸
（2）制氢气应选的发生装置为固-液不加热型，可用浓硫酸干燥，这两个条件该方案都满足，但氢气的密度比空气小，应用向下排空气法收集，但本方案中的收集方法是向上排空气法．制二氧化碳应选的发生装置为固-液不加热型，可用浓硫酸干燥，用向上排空气法收集，这些条件该方案都满足．
故答案为：不可行，因为氢气的密度比空气小，要用向下排空气法收集可行

点评：
本题考点：常用气体的发生装置和收集装置与选取方法；化学实验方案设计与评价；气体的干燥（除水）；氧气的制取装置；二氧化碳的实验室制法；氢气的制取和检验；书写化学方程式、文字表达式、电离方程式．

考点点评：制取气体的基本发生装置和收集装置就那么几种，但在制取某一种气体时所选的发生装置和收集装置一定要组合好．

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（2）SO₃与亚硫酸氢钠溶液反应生成SO₂；
（3）Cu₂S+4H₂SO₄（浓）═2CuSO₄+S↓+2SO₂↑+4H₂O中，Cu₂S中Cu、S元素化合价均升高，硫酸中S元素的化合价降低；
（4）氮的固定为游离态（氮气）转化为化合态（氮的化合物），以此来解答．
（1）NH₄NO₃、KCl、Na₂SO₄、（NH₄）₂SO₄四瓶溶液分别与Ba（OH）₂反应的现象为：刺激性气体、无现象、白色沉淀、既有刺激性气体也有白色沉淀生成，现象不同，可检验，即鉴别试剂为Ba（OH）₂，故答案为：Ba（OH）₂；
（2）SO₃与亚硫酸氢钠溶液反应生成SO₂，且不引入新杂质，则除杂试剂为Na₂HSO₃，故答案为：Na₂HSO₃；
（3）Cu₂S+4H₂SO₄（浓）═2CuSO₄+S↓+2SO₂↑+4H₂O中，Cu₂S中Cu、S元素化合价均升高，硫酸中S元素的化合价降低，则氧化产物为CuSO₄、S，生成硫酸铜体现浓硫酸的酸性，生成二氧化硫体现浓硫酸的强氧化性，故答案为：CuSO₄、S；强氧化性、酸性；
（4）氨气、NO均为氮的化合物，只有bc中为单质转化为化合物，符合氮的固定，故答案为：bc．

点评：
本题考点：物质的检验和鉴别的基本方法选择及应用；氮的固定；氧化还原反应．

考点点评：本题考查较综合，涉及物质鉴别、除杂、氧化还原反应及氮的固定，为高频考点，侧重基础知识的考查，把握物质的性质、常见离子的检验、元素的化合价分析等为解答的关键，题目难度不大．

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用所给动词的适当形式填空,必要时借助助动词 用所给动词的适当形式填空,必要时借助助动词 Zhao Jun ____________(have ) eggs and milk for breakfast My brother ____________(eat) lots of ice cream Mr Green _________(not have)a green jacket ____________ Jack _____________(need) apples? Lucy and Lily___________(have)some good friends in China My father ________(play)sports every evening. __________you__________(know)the room number? They _________(not run)in the afternoon 凝宁柠1年前1: dongliheng 共回答了22个问题 | 采纳率86.4%

1.Zhao Jun (has) eggs and milk for breakfast.
2.My brother (ate) lots of ice cream.
3.Mr Green (doesn't have) a green jacket.
4.(Does) Jack (need) apples?
5.Lucy and Lily (have) some good friends in China.
6.My father (plays) sports every evening.
7.(Do) you (know) the room number?
8.They (don't run) in the afternoon.

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英语翻译!求好手帮忙翻译下.解决难题要打开思维的空间,多角度全方位考虑,突破思维定势；必要时可向同学和老师求教.哪位高手 英语翻译!求好手帮忙翻译下. 解决难题要打开思维的空间,多角度全方位考虑,突破思维定势；必要时可向同学和老师求教.哪位高手帮忙翻译下?在线等急 在翻译下这句,牢固掌握基础知识是解决难题的关键.谢谢! 朱院宁1年前1: 初始的记忆共回答了18个问题 | 采纳率83.3%

To solve a problem requires one to think with open mind , through different aspects and by multiple perspectives; he or she should also consult teachers and classmates when necessary.字数不够了hi我

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给我些有哲理性的高中作文题目如《朝花夕拾》《杯中窥人》．．．．．．必要时还请加以解释或对应的范文 luguanfei1年前1: 震草飞共回答了21个问题 | 采纳率95.2%

《缩小你的梦想》 “梦想” "自己" "距离" "脚踏实地"
《山谷中的谜底》 "压力” “为自己减压” “直与曲” “改变自己与适应环境” “学会生存”
《一生只做一件事》
《选定一把椅子》
字数不够了

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（12分）拟用下图装置制取表中的四种干燥、纯净的气体（图中铁架台、铁夹、加热及气体收集装置均已略去；必要时可以加热；a、 （12分）拟用下图装置制取表中的四种干燥、纯净的气体（图中铁架台、铁夹、加热及气体收集装置均已略去；必要时可以加热；a、b、c、d表示相应仪器中加入的试剂）。 气体 a b c d Cl₂ 浓盐酸 MnO₂ NaOH溶液 浓H₂ SO₄ NH₃ 饱和NH₄ Cl溶液 消石灰 H₂ O 固体NaOH NO 稀HNO₃ 铜屑 H₂ O P₂ O₅ (1)写出制取Cl₂ 的化学方程式________________________。 写出制取NO的化学方程式________________________。 (2)上述方法中可以得到干燥、纯净的气体是。 (3)指出不能用上述方法制取的气体，并说明理由（可以不填满） ①气体，理由是。 ②气体，理由是。 ③气体，理由是。 野愉舟1年前1: arlo0423 共回答了14个问题 | 采纳率92.9%

(1) MnO₂ + 4HCl（浓） MnCl₂ + Cl₂ ↑+ 2H₂ O
3Cu + 8HNO₃ ＝3Cu(NO₃ )₂ + 2NO↑+4H₂ O
(2) NO (3) ①Cl₂ 反应生成的Cl₂ 被c中的NaOH溶液吸收了
②NH₃ 反应生成的NH₃ 被c中的H₂ O吸收了

（1）实验室制取氯气和NO的方程式分别是MnO₂ + 4HCl（浓） MnCl₂ + Cl₂ ↑+ 2H₂ O、3Cu + 8HNO₃ ＝3Cu(NO₃ )₂ + 2NO↑+4H₂ O。
（2）氯气能溶于氢氧化钠溶液，氨气极易溶于水，NO不溶于水，所以可以得到干燥、纯净的气体是NO。
（3）①氯气能和氢氧化钠溶液反应，反应生成的Cl₂ 被c中的NaOH溶液吸收了，所以得不到氯气。
②氨气极易溶于水，反应生成的NH₃ 被c中的H₂ O吸收了，所以得不到氨气。

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试对以上情境提出问题,并讨论解答（必要时可对情境做适当补充）：某班级组织去风景区春游,大部分同学先坐公共汽车前往,平均速 试对以上情境提出问题,并讨论解答（必要时可对情境做适当补充）：某班级组织去风景区春游,大部分同学先坐公共汽车前往,平均速度每小时24千米,4名负责后勤的同学晚半小时坐校车出发,速度每小时60千米,结果同时到达山脚下,到达后发现乘坐缆车上山费用较大,且不能浏览风景.于是商定：大部队步行上山,4名后勤改为先遣队,乘缆车上山,做好在山顶举行活动的准备.缆车的速度是步行的3倍,步行同学中途中在一个景点逗留10分钟,到达山顶时比先遣队慢半小时. xjh456xjh1年前1: lilfeng86 共回答了25个问题 | 采纳率88%

（1）问：学校到风景区相距多少千米?
设相距S千米.
S/24-S/60=0.5
S=20
（2）问：公共汽车和校车到达风景区的时间比是多少?
设学校到风景区相距S千米.
S/24：S/60=5:2

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玻璃仪器的洗涤普通洗涤：在试管等仪器内注入一半水,震荡后倒掉,反复几次即可,必要时可选择合适的_____________ 玻璃仪器的洗涤 普通洗涤：在试管等仪器内注入一半水,震荡后倒掉,反复几次即可,必要时可选择合适的__________________,配合去污粉洗涤剂洗涤,然后用水冲洗 husping1年前1: iam毓儿共回答了17个问题 | 采纳率88.2%

化学试剂

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拟用下图所示装置制取四种干燥、纯净的气体（图中加热装置和气体的收集装置均已略去；必要时可以加热；a、b、c、d表示相应仪 拟用下图所示装置制取四种干燥、纯净的气体（图中加热装置和气体的收集装置均已略去；必要时可以加热；a、b、c、d表示相应仪器中加入的试剂）。其中不能达到目的的是 选项 制取气体 a b c d A NO 稀硝酸 铜片 H₂ O 浓硫酸 B O₂ 双氧水 MnO₂ H₂ O 浓硫酸 C NH₃ 浓氨水 碱石灰 浓硫酸 H₂ O D SO₂ 浓盐酸 Na₂ SO₃ 粉末 NaHSO₃ 溶液 浓硫酸 离云伤逝1年前1: mf11011911 共回答了17个问题 | 采纳率100%

C

C错误，浓氨水中加入碱石灰可以快速制取氨气，但氨气是碱性气体，不能用硫酸干燥，应用碱石灰干燥，且氨气极易溶于水，应用向下排空气法收集；

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阅读下面短文，用括号内所给动词的适当形式填空，必要时可加助动词或情态动词。(请将各小题答案写在短文后相应的横 阅读下面短文，用括号内所给动词的适当形式填空，必要时可加助动词或情态动词。(请将各小题答案写在短文后相应的横线上) Do you still remember Old Henry? Last Sunday, he 小题1: (go) for a walk with Wang Wang, his cute dog. It was a nice day. Old Henry sat down and watched Wang Wang 小题2: (play) with a friendly black cat. Then it was time to go home. Old Henry looked for his dog. But Wang Wang 小题3: (be) not there! Now Old Henry is very sad. He 小题4: (miss) his dog and doesn’t want to do anything. 乱七八糟的心1年前1: 恋上修罗共回答了20个问题 | 采纳率75%

小题1: went小题2:play ∕ playing小题3:was小题4:misses 小题1:本句的含义为上个星期天他和他的狗出去散步了，本句表示过去，故本句空格处填去的过去式went。小题2:本句的含义为亨利看到旺旺正在同一...

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拟用下图装置制取表中的四种干燥、纯净的气体（图中铁架台、铁夹、加热及气体收集装置均已略去；必要时可以加热；a、b、c、d 拟用下图装置制取表中的四种干燥、纯净的气体（图中铁架台、铁夹、加热及气体收集装置均已略去；必要时可以加热；a、b、c、d表示相应仪器中加入的试剂）。 （1）上述方法中可以得到干燥、纯净的气体是___________。 （2）指出不能用上述方法制取的气体，并说明理由（可以不填满） ①气体___________，理由是______________________。 ②气体___________，理由是______________________。 ③气体___________，理由是______________________。 ④气体___________，理由是______________________。 想说不敢说1年前1: 拉风抱抱牛共回答了18个问题 | 采纳率88.9%

（1）NO
（2）①C₂ H₄ ；装置中没有温度计，无法控制反应温度
②Cl₂ ；反应生成的Cl₂ 被c中的NaOH溶液吸收了
③NH₃ ；反应生成的NH₃ 被c中的H₂ O吸收了

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在空白处填入适当的关系代词,必要时用“介词+whom”或“介词+which”的形式完成下列填空题. 在空白处填入适当的关系代词,必要时用“介词+whom”或“介词+which”的形式完成下列填空题. The bank _____ was opened last week is a very modern one. The player ______ I beat in the table tennis was a seed player. The town,_____ thousands of travelers visit every year,was very famous. The man ______ you shook hands just now is our headmaster. The room _____ my family live used to be a garage. My sister,______ I went to the concert last night,will leave soon. The students,most ____ are from the north,are not used to the winter in Shanghai. The city ______ I was born has experienced great changes. I still remember the day ______ we first met. I’m afraid this is the reason ______ he left the company. The house ______ I would like to buy is not far away. Thank you for the help ______ you have given me. He went to the primary school ____ he once studied for four years. I know the forest ______ you can find wild strawberries. He has written a book,the name ____ have completely forgotten. everglory4191年前3: d5f41 共回答了23个问题 | 采纳率95.7%

The bank _which_ was opened last week is a very modern one.
The player _whom_ I beat in the table tennis was a seed player.
The town,_to which_ thousands of travelers visit every year,was very famous.
The man _with whom_ you shook hands just now is our headmaster.
The room _in which_ my family live used to be a garage.
My sister,_with whom_ I went to the concert last night,will leave soon.
The students,most of whom_ are from the north,are not used to the winter in Shanghai.
The city _in which_ I was born has experienced great changes.
I still remember the day _which_ we first met.
I’m afraid this is the reason _which_ he left the company.
The house _which_ I would like to buy is not far away.
Thank you for the help _which_ you have given me.
He went to the primary school _which_ he once studied for four years.
I know the forest _which_ you can find wild strawberries.
He has written a book,the name _which_ have completely forgotten.

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各位亲、下列英语怎么写?填空,必要时要写上at/on/in.1._____1 June 2._____the after 各位亲、下列英语怎么写? 填空,必要时要写上at/on/in. 1._____1 June 2._____the afternoon 3.______two thirty 4._____Friday 5._____2013 6._______september 7._____25 December 8.____last Thursday 9.______11:45 10._____Children Day 11.______Christmas 12.______the morning 13.____a cold morning 14.______Saturdy night 15._____night 16._____the end of the day 17.______the weekend 18.______winter 19._____every Monday 20._____the evening of May 1st 21._____November 27th,2010 22.______this moment 23.______tomorrow evening 24.______summer 25._____noon 用in/at/on填空. 1.Don't sit ______the grass.It's wet. 2.There are a lot od fish _____the sea. 3.There are many people waiting for the bus ____the stop. 4.There's a small park_____the top of the hill. 5.I'm sorry I'm late.My car broke down _____the way here. 6.She always go to work____a bicycle . 7.My name was ______the bottom of the name list. 8.There is a mirror_____the wall _____the living room. 9.She is standing _____the middle of the room now. 10.What is the longest river _____China? 11.Were there many people _____the party last night? 12.Who is the man _____this photograph?Do you know him? 按要求改写句子. 1.Why don't you make him a card?(同义句） Why ______make a card ______him? 2.My friends often play football at night.(改为一般疑问句） ________　________ friends _______football at night? 3.I'm sorry I don't know .(同义句） I'm ______I have _____ _______. 4.How many new words are there in Lesson One .(同义句） How many new words are there in _______ _______? 5.Don't be late tomorrow,please.(同义句） Please be _____ _____ tomorrow. whj9911年前1: zzpzxp7824 共回答了19个问题 | 采纳率89.5%

1.at June
2.in the afternoon
3.at two thirty
4.on Friday
5.in 2013
6.in September
7.on 25th of December
8.on last Thursday
9.at 11:45
10.on Children's Day
11.on Christmas
12.in the morning
13.on a cold morning
14.on Saturdy night 1
5.at night
16.at the end of the day
17.on the weekend
18.in winter
19.on every Monday
20.on the evening of May 1st
21.on November 27th,2010
22.at this moment
23.on tomorrow evening
24.on summer
25.at noon
用in/at/on填空.
1.Don't sit on the grass.It's wet.
2.There are a lot od fish in the sea.
3.There are many people waiting for the bus at the stop.
4.There's a small parked on top of the hill.
5.I'm sorry I'm late.My car broke down on the way here.
6.She always go to work on a bicycle .
7.My name was at the bottom of the name list.
8.There is a mirror on the wall in the living room.
9.She is standing at the middle of the room now.
10.What is the longest river in China?
11.Were there many people at the party last night?
12.Who is the man on this photograph?Do you know him?
按要求改写句子.
1.Why don't you make him a card?(同义句）
Why not make a card for him?
2.My friends often play football at night.(改为一般疑问句）
Do my friends play football at night?
3.I'm sorry I don't know .(同义句）
I'm sorry,I have no idea.
4.How many new words are there in Lesson One .(同义句）
How many new words are there in _______ _______?
5.Don't be late tomorrow,please.(同义句）
Please be late for tomorrow.
希望这个答案帮助了你!

1年前查看全部

用括号中所给动词的适当形式天空,必要时可加词 用括号中所给动词的适当形式天空,必要时可加词 1、Mrs Green made Alice ______(sweep) the floor after supper. 2、The students are busy ________(get)ready for the exam. woyun3983456351年前2: 4hach8 共回答了20个问题 | 采纳率90%

sweep
getting

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（2012•大连模拟）用如图所示装置制取表中的四种干燥、纯净的气体（图中加热及气体收集装置均已略去；必要时可以加热；a、 （2012•大连模拟）用如图所示装置制取表中的四种干燥、纯净的气体（图中加热及气体收集装置均已略去；必要时可以加热；a、b、c、d表示相应仪器中加入的试剂）．上述方法中可以得到干燥、纯净的气体是（　　） 气体 a b c d CO₂ 稀盐酸 CaCO₃ 饱和Na₂CO₃ 浓H₂SO₄ Cl₂ 浓盐酸 MnO₂ NaOH溶液浓H₂SO₄ SO₂ 稀H₂SO₄ Cu 品红溶液浓 H₂SO₄ H₂ 稀盐酸锌粒 NaOH溶液浓H₂SO₄ A．CO₂ B．Cl₂ C．SO₂ D．H₂ 判命1年前1: Ameili100 共回答了14个问题 | 采纳率78.6%

解题思路：根据反应装置知，反应物必须是固液混合物且不需要加热，根据洗气装置知，气体不能与洗液反应，否则收集不到气体，根据干燥装置知，干燥剂只能吸收水不能和收集气体反应，据此分析解答．
A．盐酸和大理石反应制取二氧化碳且不需加热，碳酸钠溶液能溶解二氧化碳，所以不能用碳酸钠溶液洗气，可用浓硫酸干燥二氧化碳，故A错误；
B．浓盐酸和二氧化锰制取氯气需要加热，且氯气和氢氧化钠反应而导致收集不到氯气，故B错误；
C．稀硫酸与金属铜不反应，故C错误；
D．盐酸和锌粒反应产生氢气，用氢氧化钠除去氢气中的氯化氢气体，用浓硫酸干燥氢气，故D正确．
故选D．

点评：
本题考点：常见气体制备原理及装置选择．

考点点评：本题考查了气体的发生、洗气和干燥装置，明确气体的性质是解本题的关键，难度不大．

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在实验室中，利用如图装置可以制取并收集多种气体（必要时可以加热）． 在实验室中，利用如图装置可以制取并收集多种气体（必要时可以加热）． （1）李明同学想选择下列装置制取干燥、平稳、大小可控的氧气流，应优先选择的气体发生装置是______ （填装置符号），其制取氧气的化学反应方程式为 2H₂0₂ MnO2 . 2H₂0+O₂↑ 2H₂0₂ MnO2 . 2H₂0+O₂↑ ，C瓶中盛放的试剂是______． （2）李明同学还想利用上述实验装置用H₂还原氧化铜，但王强同学认为要将其中的一个装置改造后，才能进行H₂还原氧化铜的实验．这个实验装置的改造方法是______． jeffer9991年前1: 四哥哥1 共回答了18个问题 | 采纳率94.4%

解题思路：制取装置包括加热和不需加热两种，如果用双氧水制氧气就不需要加热，想选择装置制取干燥、平稳、大小可控的氧气流，应优先选择的气体发生装置是用分液漏斗的装置，因为此装置可控制反应的发生和停止；如果用高锰酸钾或氯酸钾制氧气就需要加热，氧气可以用浓硫酸干燥．氧气的密度比空气的密度大，不易溶于水，因此能用向上排空气法和排水法收集．想利用上述实验装置用H₂还原氧化铜，只要把A装置去塞，并将导管伸入试管底部；或D装置试管口略向下倾斜，去塞，将导管伸入试管底部；两种方法都可以进行．
（1）如果用双氧水制氧气就不需要加热，想选择装置制取干燥、平稳、大小可控的氧气流，应优先选择的气体发生装置是用分液漏斗的装置，因为此装置可控制反应的发生和停止；氧气可以用浓硫酸干燥，故答案为：B；2H₂0₂

MnO2
.
2H₂0+O₂↑；浓硫酸
（2）想利用上述实验装置用H₂还原氧化铜，只要把A装置去塞，并将导管伸入试管底部；或D装置试管口略向下倾斜，去塞，将导管伸入试管底部；两种方法都可以进行；故答案为：A装置去塞，并将导管伸入试管底部（或D装置试管口略向下倾斜，去塞，将导管伸入试管底部）

点评：
本题考点：常用气体的发生装置和收集装置与选取方法；气体的干燥（除水）；实验室制取氧气的反应原理；碳、一氧化碳、氢气还原氧化铜实验．

考点点评：本考点主要考查气体的制取装置和收集装置的选择，同时也考查了化学方程式的书写，综合性比较强．气体的制取装置的选择与反应物的状态和反应的条件有关；气体的收集装置的选择与气体的密度和溶解性有关．本考点是中考的重要考点之一，主要出现在实验题中．

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区别Na2SO4、NH4NO3、KCl、（NH4）2SO4 四瓶无色溶液,应该加什么试剂?必要时可以加热 区别Na2SO4、NH4NO3、KCl、（NH4）2SO4 四瓶无色溶液,应该加什么试剂?必要时可以加热 说明原因 别拿版猪不当干粮1年前2: 宝宝LQ 共回答了17个问题 | 采纳率94.1%

只能加一种吗?Ba(OH)2
加入Ba(OH)2之后出现白色沉淀的是Na2SO4和（NH4）2SO4,然后再加热这两个溶液,瓶口有刺激性气味的是（NH4）2SO4
加入Ba(OH)2之后无现象的是NH4NO3、KCl,也是加热,瓶口有刺激性气味的是NH4NO3

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哪些药物会使肾上腺素的升压作用翻转为降压作用?必要时可否用去甲腺素或肾上腺素升压? §黄毛§1年前1: isabetty-lxl 共回答了13个问题 | 采纳率69.2%

除α受体阻断药外,利血平阻断神经递质的传递,也有降压作用；硝普钠、其他的降压药物如ACEI及ARB类药物、钙通道阻滞剂等等级也可以降压.

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短文填空。阅读短文，用括号内所给动词的适当形式填空，必要时，可加助动词或情态动词等。 短文填空。 阅读短文，用括号内所给动词的适当形式填空，必要时，可加助动词或情态动词等。 Restaurant owners have to know how __1__ (make) food. They also have to know how to make money. Here are some things they __ 2 __ (learn) from scientific studies. The color red __3 __ (make) people hungry. Red also makes customers __4 __ (eat) fast food restaurants, therefore, have red furniture or walls. Soft colors like pink and light blue make people __5 __ (relax), so they spend more time __ 6 __ (eat) their meals. Soft lighting __7 __ (make) people look good, but it makes food look bad. Loud music makes people want __8__ (leave). Hard seats also __ 9 __ (make ) customers want to eat quickly and leave. Many restaurants, especially fast food restaurants, use this knowledge __ 10__ (make) customers eat faster. 359453551年前1: 空港块线共回答了11个问题 | 采纳率100%

1. to make2. have learned3. makes 4. eat5. relaxed
6. eating 7. makes8. to leave 9. make10. to make

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阅读下面短文，用括号内所给动词的适当形式填空（必要时可加情态动词或助动词）。 阅读下面短文，用括号内所给动词的适当形式填空（必要时可加情态动词或助动词）。 Tom worked in the office of Mr Bates. One day, when Tom got to the office, a letter小题1:_________(wait) for him. He opened it. “Dear Tom,” the letter said, “I小题2:________(write) to thank you for your help. You小题3:_________(help) me so much when I came to your office. Here’s a ticket for the big football match.” Tom looked at the ticket. He could not believe that he had it. Everyone looked forward to小题4:__________(watch) the match! “ I must watch the match,” he though. “ I must. I小题5:_______(expect) the big match for 4 year.” Tom thought and though. He小题6:________(not put) his heart into any work. Then at twelve o’clock he knew what 小题7:__________(do). He went out of the office and called his sister, Jean. At one o’clock Mr Bates came up to him. “I have bad news for you, Tom. Your sister telephoned just now. Your mother小题8:_______(send) to hospital a moment ago.” “Thank you,” Tom said. “I will go to the hospital. I 小题9:________(come) back as soon as possible.” In fact, Tom 小题10:_________(leave) the office quickly for the football ground. Tom’s ticket was a good one. He could stand near the front. The next morning, when Tom got to the office, Mr Bates came up to him. “You’re fired(解雇), Tom.” Then he walked away angrily. “But why?” Tom asked. Then a girl said, “We saw the match on TV here yesterday! You were on TV! Tom, you had such a good ticket!” zhang55581年前1: pccloud 共回答了22个问题 | 采纳率86.4%

小题1:was waiting
小题2:am writing
小题3:helped
小题4:watching
小题5:have expected
小题6:couldn’t put
小题7:to do
小题8:was sent
小题9:will come
小题10:left

小题1:文章整体时态是过去正在进行，因此was waiting.
小题2:直接说的现在正在进行，用现在进行时 am writing.
小题3:描述的是过去，一般过去时。Helped
小题4:look forward to 的to 是介词，后面用doing.
小题5:for 4 years, 现在完成时和一段时间连用。
小题6:情态动词的否定couldn’t.
小题7:宾语从句， what to do.
小题8:一般过去时，不规则动词，send,sent,sent.
小题9:一般将来时，will+do构成。
小题10:一般过去时，不规则动词，leave,left,left.

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实现我们的理想，最关键的是（） A．要对人生做出规划 B．必要时，对自己 实现我们的理想，最关键的是（） A．要对人生做出规划 B．必要时，对自己的理想适当调整 C．脚踏实地全力以赴 D．等待时机成熟 zsfsfj1年前1: feiyingqishi 共回答了22个问题 | 采纳率81.8%

C

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Some parts of this pump may wear out quickly in the usage,which need to be attached to the equipment and replaced when necessary.The list of these parts is as follows:

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1. was
2. hiccupping
3. called
4. walk
5. loving

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根据反应装置知，反应物必须是固体和液体；由洗气装置知，该气体是中性气体或酸性气体；由收集装置知，气体不与氧气反应，且密度大于空气密度．
A、铜和稀硝酸反应制一氧化氮，一氧化氮和氧气反应，且密度小于空气密度，所以不符合条件，故A错误；
B、氯化钠与浓硫酸制氯化氢符合条件，故B正确；
C、大理石和稀硫酸制二氧化碳，大理石和稀硫酸反应生成硫酸钙附着在大理石表面，阻止了进一步的反应，故C错误；
D、锌颗粒与稀硫酸制氢气，氢气的密度小于空气的密度，所以不符合条件，故D错误．
故选B．

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用括号内所给单词的适当形式填空,必要时可加助动词. 用括号内所给单词的适当形式填空,必要时可加助动词. 顺便把那三道选择也做了吧 轻狂如我21年前1: 壹網情深共回答了18个问题 | 采纳率88.9%

5.C
6.B
7.D

lies
meaning
named
importance
written
to lend
dead
to have
was punished
warmth

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只有重力和弹力做功,机械能守恒!
没有外力作用时,动量守恒!
动能守恒?（机械能=动能+势能势能包括重力势能和弹性势能等）所以没有动能守恒的说法!
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（1）driving
（2）has driven
（3）has
（4）don't drive
(5)take
(6)to stop
(7)stopped
(8)turned
(9)changed
(10)came

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阅读下面短文,用括号内所给动词的适当形式填空(必要时可加情态动词或助动词) 阅读下面短文,用括号内所给动词的适当形式填空(必要时可加情态动词或助动词) A farmer had some dogs to sell.He painted a sign advertising the dogs.A little boy came up to him and said,“Sir,I want to buy a dog.” “Well,”the farmer said,“but they are very expensive.”The boy (64) _______________(take) some changes out of his pocket,“I’ve got thirty-nine cents.Is that enough to take a dog?” “Sure.I have six dogs.You (65) ________ (choose) any of them.” Then the farmer whistled,“Dolly!” At once,Dolly ran out of the doghouse followed by four little dogs.Then the little boy’s eyes danced with happiness.But the boy saw another little dog (66) ___________________________ (move) out slowly.This one was the smallest.She was trying her best (67) _________________________ (catch) up with the others… “I went that one,” the boy said,pointingto the last one.The farmer was surprised.“She (68) _________________________ (not run) and play with you like other dogs.Will you still want to buy her?” he said kindly. Hearing that,the little boy rolled(卷起) up one leg of his trousers.A steel brace(支架) (69) _____________________ (tie 捆,绑) on both sides of his leg.Looking up at the farmer,he said,“So you see,Sir.I can’t walk very well myself,I (70) ____________________________ (understand) her.So we will be good friends.” 阅读短文,根据短文内容及首字母提示,在空白处填入一个适当的单词. She is Liu Hui ,a middle school student in Anhui,one of the “ stay-at-home children” in her town.Liu Hui is 12 years old and lives (71)w_________ her sister.Her parents left home to make money in big cities when she was (72) o________ four.Liu Hui has to take (73) c_________ of her younger sister.They have to stay at home alone (74) b________ they have to go to school. “I used to feel (75) s________ without my parents at home,” she said,“but now I know (76) w_________ they do so.They have to go away to make money for (77) u_________ so that we can live a better life.” Every day,Liu Hui gets up at 6:30 a.m.and cooks (78) b_____.Then the two girls go to school.They have supper at 6:00 p.m.Then Liu Hui does housework and (79) h____ her sister with her homework.She usually goes to bed at 9:30 p.m. Though busy,Liu Hui is still the (80) b__ student in her class.She said,“My life is OK.But I still hope my parents will come back and live with us.” 虫我两忘1年前2: Metal888 共回答了26个问题 | 采纳率88.5%

阅读下面短文,用括号内所给动词的适当形式填空(必要时可加情态动词或助动词)
A farmer had some dogs to sell.He painted a sign advertising the dogs.A little boy came up to him and said,“Sir,I want to buy a dog.”
“Well,”the farmer said,“but they are very expensive.”The boy (64) ______took_________(take) some changes out of his pocket,“I’ve got thirty-nine cents.Is that enough to take a dog?”
“Sure.I have six dogs.You (65) ____may/can/shall choose____ (choose) any of them.” Then the farmer whistled,“Dolly!” At once,Dolly ran out of the doghouse followed by four little dogs.Then the little boy’s eyes danced with happiness.But the boy saw another little dog (66) _________moving__________________ (move) out slowly.This one was the smallest.She was trying her best (67) _______to catch__________________ (catch) up with the others…
“I went that one,” the boy said,pointingto the last one.The farmer was surprised.“She (68) ______cannot run___________________ (not run) and play with you like other dogs.Will you still want to buy her?” he said kindly.
Hearing that,the little boy rolled(卷起) up one leg of his trousers.A steel brace(支架) (69) ____tied_________________ (tie 捆,绑) on both sides of his leg.Looking up at the farmer,he said,“So you see,Sir.I can’t walk very well myself,I (70) ____can understand____ (understand) her.So we will be good friends.”
阅读短文,根据短文内容及首字母提示,在空白处填入一个适当的单词.
She is Liu Hui ,a middle school student in Anhui,one of the “ stay-at-home children” in her town.Liu Hui is 12 years old and lives (71)with her sister.Her parents left home to make money in big cities when she was (72) o___nly_____ four.Liu Hui has to take (73) c_____are____ of her younger sister.They have to stay at home alone (74) b__ecause______ they have to go to school.
“I used to feel (75) s___(想不出来了.)_____ without my parents at home,” she said,“but now I know (76) w___hy______ they do so.They have to go away to make money for (77) u___s______ so that we can live a better life.”
Every day,Liu Hui gets up at 6:30 a.m.and cooks (78) b__reakfast___.Then the two girls go to school.They have supper at 6:00 p.m.Then Liu Hui does housework and (79) h_elp___ her sister with her homework.She usually goes to bed at 9:30 p.m.
Though busy,Liu Hui is still the (80) b_est_ student in her class.She said,“My life is OK.But I still hope my parents will come back and live with us.”

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可以用适当的动词形式填空,必要时可用情态动词~ 可以用适当的动词形式填空,必要时可用情态动词~ 1、I am rather worried.Jane______(arrive)by now,but she has not appeared. 2、That is funny.Jim___(come)into the house and gone out again,but I did not hear him. luckybirdy1年前4: wwww3003 共回答了27个问题 | 采纳率81.5%

should have been简本该现在就到的,但是她还没出现,我有点担心了.
had come根据后面的“gone”判断为完成式

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英语高手请进,用括号中的介词合并两个句子,必要时可进行一些改动,动名词要作介词短语的宾语.1）We stood in t 英语高手请进, 用括号中的介词合并两个句子,必要时可进行一些改动,动名词要作介词短语的宾语. 1）We stood in the rain for hours .Then we said goodbye to each other.(after) 2) He failed the exam .He was worried .(about) 3)She heard that her son was missing .She ran out to look her son.(on) 4)He knocked loudly on the door .He entered the house .(before) 5)The visitor damaged our piano and then left.He didn't apologize.(without) 6)He has made his fortune .He has changes a great deal.(since) 7)She made such an unexpected decision .Her friends were all surprised.(at) 8)She helped the little boy to learn English.She took great delight in that.(in) 9)They have given us a lot of help.We feel grateful to them(for) 10)She had stood for a whole day.Her legs became swollen.(from) kknn1年前5: 梅心已oo 共回答了17个问题 | 采纳率88.2%

1.We said goodbye to each other after standing in the rain for hours.
2.He was worried about his failing the exam .
3.On hearing that her son was missing,she ran out to look for her son .
4.He knocked loudly on the door before entering the house.
5.The visitor damaged our piano and then left without apologizing .
6.He has changed a great deal since he has made his fortune.
7.Her friends were all surprised at her making such an unexpected decision.
8.She took great delight in helping the little boy to learn English.
9.We feel grateful to them for their giving us a lot of help.
10.Her legs became swollen from standing for a whole day.
仅供参考,不胜荣幸.

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【高中化学求助】各取0.1MOL铜分别投入组量的下列四种酸中(必要时可加热):1、浓硫酸 2、浓硝酸 3、稀硫酸 4、稀 【高中化学求助】 各取0.1MOL铜分别投入组量的下列四种酸中(必要时可加热): 1、浓硫酸 2、浓硝酸 3、稀硫酸 4、稀硝酸 充分感应后,在相同条件下得到的气体体积由大到小的顺序是 A、2413 B、2143 C、1243 D、3412 迷惑中~~请指导~谢谢~越详细越好```感激不尽 lybill1年前1: yysbjb 共回答了19个问题 | 采纳率100%

Cu与浓硝酸反应生成0.2mol二氧化氮,与稀硝酸反应生成0.067mol一氧化氮,与浓硫酸反应生成0.1mol二氧化硫,与稀硫酸不反应,所以选B.
至于解的方法,先配平,然后再比较量!

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高数求教高手必要时给个说明! 我的宝宝叫洋洋1年前0: 共回答了个问题 | 采纳率

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阅读下面短文，用括号内所给动词的适当形式填空(必要时可加情态动词或助动词) 阅读下面短文，用括号内所给动词的适当形式填空(必要时可加情态动词或助动词) A farmer had some dogs to sell. He painted a sign advertising the dogs. A little boy came up to him and said, “Sir, I want to buy a dog.” “Well,” the farmer said, “but they小题1:_____________________ (be) very expensive.” The boy 小题2: _____________________ (take) some changes out of his pocket, “I’ve got thirty-nine cents. Is that enough to take a dog?” “Sure. I have six dogs. You小题3: ________________________ (choose) any of them.” Then the farmer whistled, “Dolly!” At once, Dolly ran out of the doghouse followed by four little dogs. Then the little boy’s eyes小题4:____________________________ (dance) with happiness. But the boy saw another little dog小题5:___________________________ (move) out slowly. This one was the smallest. She was trying her best 小题6: _________________________ (catch) up with the others… “I went that one,” the boy said, 小题7: ____________________________ (point) to the last one. The farmer was surprised. “She 小题8: _________________________ (not run) and play with you like other dogs. Will you still want to buy her?” he said kindly. Hearing that, the little boy rolled(卷起) up one leg of his trousers. A steel brace(支架) 小题9: _____________________ (tie) on both sides of his leg. Looking up at the farmer, he said, “So you see, Sir. I can’t walk very well myself, I 小题10: ____________________________ (understand) her. So we will be good friends.” hmily_rain1年前1: 真爱慢摇共回答了18个问题 | 采纳率88.9%

小题1: are
小题2:took
小题3:can/may choose
小题4: danced
小题5: move/moving
小题6: to catch
小题7: pointing
小题8:will not/won’t/can’t run
小题9: was tied
小题10: can understand/understand

小题1:本句的含义为它们是非常昂贵的，主语为复数，故本句空格处填are。
小题2:本句的含义为男孩从口袋里拿出来一些零花钱，故本句空格处填拿出的过去式took。
小题3:本句的含义为我有6条狗，你可以选择任何一个，故本句空格处填可以选择的短语can/may choose。
小题4:本句的含义为小男孩的眼睛开心的舞动着，故本句空格处填舞动的过去式danced。
小题5:see sb do或doing sth表示看到某人或某物做某事，故本句空格处填move/moving。
小题6:try one’s best to do sth表示竭尽全力做某事，故本句空格处填to catch。
小题7:本句的含义小男孩指着最后一个说，现在分词可以表示伴随动作，故本句空格处填指向的现在分词pointing。
小题8:本句的含义为它将不像别的狗那样跟着你跑，并且同你玩，故本句空格处填将来时的否定结构will not/won’t/can’t run。
小题9:本句的含义为他的两条腿被支架连接起来，本题表示被动的意思，故本句空格处填被动结构was tied。
小题10:本句的含义为我自己不能走，我可以理解她，故本句空格处填可以理解的短语can understand。

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必要时填上for1.he is very ill.no one is allower to enter______his 必要时填上for 1.he is very ill.no one is allower to enter______his room 2.will you enter____this week's crossword competieion 3.many athletes have entered____the olymapic games this year 4.no one saw the thief when he entered ______the building 5.i have entered _______ the examination but i don't want to take it dpsz_20051年前1: tracycxy 共回答了19个问题 | 采纳率78.9%

1.X
2.for
3.for
4.X
5.fo

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区别试剂的题会的来能把Na2SO4 NH4NO3 KCl (NH4)2SO4四瓶无色溶液加以区别的一种试剂必要时可 区别试剂的题会的来 能把Na2SO4 NH4NO3 KCl (NH4)2SO4四瓶无色溶液加以区别的一种试剂必要时可以加热 A BaCl2 B NaOH C Ba(OH)2 D AgNO3 为什么是C 其他3个为啥不行用到哪些原理知识点 爱你万年1年前4: 51590221 共回答了21个问题 | 采纳率81%

c和Na2SO4反应只有沉淀,和 NH4NO3 反应只有气体,和KCl无明显现象,和(NH4)2SO4反应既有气体又有沉淀现象明显,所以能区分A和Na2SO4 (NH4)2SO4反应都有沉淀,无法区分B和Na2SO4 KCl反应也没有明显现象,无法区分D和Na2SO4...

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动词填空阅读下面短文，用括号内所给动词的适当形式填空 (必要时可加情态动词或助动词)。Afel was only a s 动词填空 阅读下面短文，用括号内所给动词的适当形式填空 (必要时可加情态动词或助动词)。 Afel was only a small boy when he first saw snow in a picture book. In the pictures he saw a lot of children 小题1:______ (play) in the snow. Afel didn’t understand what snow was. But he dreamed about snow all the time. He dreamed of being able 小题2:______ (fly) across the snow. One day when he was twelve, Afel小题3: ______ (watch) TV at his uncle’s house. The program was full of snow. Not only snow – there were people flying across the snow. “Look! They 小题4: ______ (fly)!” he shouted excitedly. The snow, and the people… It was just like one of his dreams. “They’re skiing. It needs snow,” said his uncle, “it’s the Winter Olympics. It 小题5: ______ (hold) every four years.” Afel 小题6:_________ （find）out that the next Winter Olympics would be in Sochi, Russia in 2014. “Perfect,” he thought. “Enough time for me to become a good skier. I 小题7:______ (go) to the Winter Olympics, and win the gold medal for skiing.” “But there’s no snow here!” people told him. “Where are you going to ski?” Afel made himself a pair of skis and skied across the sand. At first he couldn’t move, but he practiced and practiced until he could move quite quickly. “How will you go to the Winter Olympics?” people asked him. “Our country 小题8:______ (not, have) a team at all. Why 小题9:______ (not, do) athletics (田径) instead? We have lots of good runners. And we 小题10:______ (win) lots of medals at the Olympics.” Now Afel is practicing skiing down sand dunes (沙丘). He dreams that the yellow sand and brown earth of the desert (沙漠) is the white snow. 孙成文1年前1: xinyuangnd 共回答了20个问题 | 采纳率90%

小题1:playing
小题2:to fly
小题3:was watching
小题4:are flying
小题5:is held
小题6:found
小题7:will go/am going
小题8:doesn’t have/hasn’t had
小题9:not do
小题10:have won

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在下面的式子里填上+、-、×、÷号使等式成立,必要时可以将几个数字合并成一个数,也可以填上括号. 在下面的式子里填上+、-、×、÷号使等式成立,必要时可以将几个数字合并成一个数,也可以填上括号. 1 2 3 4=200 mandyweng1年前2: gd30696 共回答了14个问题 | 采纳率92.9%

(12X3+4X5=200!
少了一个数吧

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填空：1.分析问题是要综合运用多方面的知识,必要时可用______,_______等方法帮助分析题目中的数量关系.2.当 填空： 1.分析问题是要综合运用多方面的知识,必要时可用______,_______等方法帮助分析题目中的数量关系. 2.当出现两个以上的未知量时,应设与其他_______,________关系密切的量为未知数. 应用题（列二元一次方程组） 小明家承包了一个果园,去年果园收支相抵后,结余12000元,今年水果丰收,估计收入可比去年增加20%；并且今年因为改进了种植技术,支出比去年减少10%,这样今年结余预计比去年多11400元.请计算小明家今年种植水果的收入和支出情况. sportzhu1年前1: flyljffly 共回答了23个问题 | 采纳率87%

1 倒推假设
应用题设去年的收入和支出分别为X.Y,由题意得：
｛X-Y=12000
｛(1+20%)X-（1-10%）Y=23400 最后算出结果的X Y 然后根据第二个式子求就行了

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制取的气体	A中盛放的试剂	B中盛放的试剂	评价（回答是否可行；若不可行，说出理由）
H₂	Zn、稀H₂SO₄	浓H₂SO₄	______
CO₂	大理石、稀盐酸	浓H₂SO₄	______

气体	a	b	c	d
CO₂	稀盐酸	CaCO₃	饱和Na₂CO₃	浓H₂SO₄
Cl₂	浓盐酸	MnO₂	NaOH溶液	浓H₂SO₄
SO₂	稀H₂SO₄	Cu	品红溶液浓	H₂SO₄
H₂	稀盐酸	锌粒	NaOH溶液	浓H₂SO₄

必要时填上for.1.He is very ill.No one is allowed to enter ____his

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