牛虻和苍蝇有什么区别?

yilagy012022-10-04 11:39:541条回答

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zhlkj504588 共回答了21个问题 | 采纳率90.5%
最直观的区别在于,牛虻比较大,且会吸血;苍蝇个头较小,一般只扰人.通过这个可以延伸出,它们各自传播疾病的途径不同.牛虻有药用价值;苍蝇有经济价值,例如幼虫可以作饵料或饲料等.
1年前

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to be a social worker," Frank Blethen confides with a chuckle."That was before I knew what social workers do,and what they got paid."
Today Blethen is publisher of the Seattle Times and heads the family-run company that owns newspapers in Washington state and Maine.
But in a sense,he is a social worker.Blethen is one of journalism's loudest and most persistent critics of a trend that he sees doing real damage to society--the consolidation of American media interests into the hands of fewer and fewer giant corporations.He makes speeches on the subject,convenes meetings about it,runs advertisements about it,brings it up in dinner conversation.Before President Bush even got to the Republican convention,the Times had endorsed his opponent,in part because of John Kerry's stance against media deregulation.
Along the way,Blethen has helped blast this complex,arcane issue out of the corporate suites and onto the radar of average Americans.Against all odds,his side seems to be gaining traction.
"There's always a tipping point to these things," he says."What I think now is,it doesn't matter where you are in America,you know there's something wrong."
Call him a gadfly,call him a crusader--there are those in the industry who would call him much worse.At last spring's joint meeting of the American Society of Newspaper Editors and the Newspaper Association of America in Washington,D.C.,he spent most of his time with the editors instead of the publishers.When asked if he had stumbled into the wrong crowd,he replied with a wink,"I like to be where people want to talk to me."
Don't be fooled by Blethen's mischievous streak or snow-white St.Nick beard.Jolly he is not.Raised by a single mother,he washed dishes to help put himself through college and only went into the newspaper business in the first place to get to know his estranged father.He is unafraid to do business with bare knuckles.Several years ago his Seattle paper went through a tough newsroom strike,and even now he is waging a contentious battle against Hearst,owner of the Seattle Post-Intelligencer,over the two papers' joint operating agreement.
But shaped by his family's deep roots in community newspapering,Blethen retains the quaint notion that ownership also conveys civic responsibility.And the social worker in him feels compelled to speak truth to power.So beginning in the late 1980s,he went public with concerns about the implications of newspaper consolidation,and his alarm has risen as that consolidation has quickened.His opposition basically boils down to two things:that the corporatization of news has put the relationship of profit to good journalism out of balance,and that absentee ownership increasingly undermines hometown obligations.
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One can argue that consolidation also has exacerbated the overly cozy relationship that has developed over the years between the regulated media and their regulators.This had led to blatant conflicts of interest like those detailed by senior writer Charles Layton in this issue (see "Lobbying Juggernaut," September/October 2004).
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I remind Blethen that with half a dozen daily papers now in his portfolio,it might be said that he is a bit of a media mogul himself,yes?He laughs,concedes the point but reminds me that his family has had ties to both the Washington and Maine papers for years.Blethen suggests a reasonable rule of thumb:"If a chain gets so big that you're calling your newspapers 'properties' instead of by their names,you're too big."
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牛虻也是灰色的,但个头较大(不同于绿头苍蝇),如普通苍蝇的放大版,略黑,飞行很有力,声音较大,叮人很疼.
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下列词语中加点字读音有错误的一组是(  )
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C

C项,“伛”读yǔ。
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一蚂蚁看见一大象向它走来
便把自己埋在沙里,只留一条腿在外面,
燕子看见了便问:“喂,蚂蚁,你在干吗?”
“嘘,不要做声我想绊死哪该死的”蚂蚁回答道.
第二天,燕子又看到一群蚂蚁排队向前走,
就问:“你们做什么去呀?”
领头的蚂蚁回答:“昨天绊大象摔了一个跟头,摔成重伤,我们一起去给他献血”
过了一会儿,
燕子看见蚂蚁又拍着队回来了
就又问:“怎么这么快就抽完血了”?
领头的蚂蚁回答:“只有一只蚂蚁的血型和大象相同,所以我们都回来了,就抽他的好了”.
第三天,麻雀看见一头大象躲在一根草后面,把一条腿伸出来
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第四天,麻雀又看见一群蚂蚁排队向前走,
就问:“你们做什么去阿”?
领头的蚂蚁说:“昨天大象躲在草后面想绊我,我就把丫的腿给踩折了,现在去抬他去医院”.
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解题思路:根据两栖动物的特点和常见的两栖动物分析判断.两栖动物是指幼体生活在水中,用鳃呼吸,成体既能生活在陆地上,也能生活在水中,用肺呼吸,兼用皮肤呼吸,

蟒蛇、乌龟属于爬行动物;海鸥属于鸟类;鲸鱼、鸭嘴兽、海豚属于哺乳动物;牛虻属于昆虫.蛙、蟾蜍、蝾螈及大鲵,幼体生活在水中,用鳃呼吸,成体既能生活在陆地上,也能生活在水中,用肺呼吸,兼用皮肤呼吸,属于两栖类动物.
故选:B.

点评:
本题考点: 两栖动物的主要特征.

考点点评: 掌握各种动物的主要特征,根据动物的特征判断其类别.

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A