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14.Have you ever wondered why birds sing?(36)B After all,you probably sing or whistle when you are happy.
Some scientists believe that birds do sing some of the time just because they are happy.
(37)FTheir singing is actually a warning to other birds to stay out of their territory.Do you know what a"territory"is?A territory is an area that an animal,usually the male,claims(声称) as its won.Only he and his family are welcome there.No other families of the same species are welcome.Your yard and house are your territory where only your family and friends are welcome.If a stranger should enter your territory and threaten you,you might shout. (38)EIf so,you have actually scared the stranger away without having to fight him. (39)ABut he expects an outsider almost all the time,especially at nesting(筑巢) season.So he is screaming all the time,whether he can see an outsider or not.This screaming is what we call a bird's song,and it is usually enough to keep an outsider away.
Birds sing loudest in the spring when they are trying to attract a mate(配偶) and warn others not to enter the territory of theirs.
(40)D Most of it has to do with attracting males and setting up territories.

A.A bird does the same thing.
B.Maybe you thought that they were just happy.
C.Shouting loudly is just like a bird's screaming.
D.You can see that birds have a language of their own.
E.Probably this would be enough to frighten him away.
F.However,they sing most of the time for a very different reason.
G.So,just like human beings,birds sing for almost the same reasons.

分析 文章介绍了鸟为什么会唱歌,大部分鸟的歌声是一种警告,为了保护自己的领地不被外来者侵犯.

解答 36--40 BFEAD
36.B 考查上下文理解判断能力.根据下文After all,you probably sing or whistle when you are happy可知,毕竟,当你高兴的时候你可能唱歌或吹口哨.由此可知,前文应是:鸟可能也是高兴才唱歌.故选B.
37.F 考查上下文理解判断能力.根据下文Their singing is actually a warning to other birds to stay out of their territory可知,鸟的唱歌实际上是一种警告其它的鸟避开它们的领地.由此可知,前文应是:它们大多数时候唱歌是因为不同的原因.故选F.
38.E 考查上下文理解判断能力.根据下文If so,you have actually scared the stranger away without having to fight him可知,如果这样,你实际上不必同他作斗争而吓走陌生人.由此可知,前文应是:这可能足够吓走他.故选E.
39.A 考查上下文理解判断能力.根据前文:If so,you have actually scared the stranger away without having to fight him可知,如果这样,你实际上不必同他作斗争而吓走陌生人.由此可知,下文应是:鸟也做着同样的事情.故选A.
40.D 考查上下文理解判断能力.根据前文Birds sing loudest in the spring when they are trying to attract a mate and warn others not to enter the territory of theirs可知,当它们努力吸引配偶和警告其它的鸟不要进入它们的领地时唱歌声音最大.由此可知,下文应是:你可能明白鸟也有自己的语言.故选D.

点评 七选五题型看似简单,实际上有时完全作对并不容易,需要方法和分析能力及足够的耐力,有必要进行专门练习.首先,快速浏览一遍七个备选答案,先确定哪个选项适合放在文章的什么位置.其次,快速浏览文章,确定文章体裁,抓住文章结构,分析篇章结构,找出各段的主题句或主旨大意.其三,注意各选项中出现的句子衔接手段,寻找句中衔接标志词,七选五备选答案中有两个多余的选项,会对文章中两个空的选择构成干扰,这时要特别细致地比对相似选项.最后,用代入法,检查答案是否合理,将所有选择答案放回空白处,通读全文,检查文章内容是否语义连贯合理、紧扣主题,语篇结构是否通顺连贯、具有一致性、合乎逻辑,写作思路是否清晰明了,格式以及用语是否恰当贴切,从而判断选择的答案是否正确.

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