15.Have you ever wondered why birds sing?Maybe you thought that they were just happy.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.However,they sing most of the time for a very different reason.Their 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(聲稱)as its own.Only he and his family are welcome there.No other families of the same species(物種)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.Probably this would be enough to frighten him away.
If so,you have actually scared the stranger away without having to fight him.A bird does the same thing.But he expects an outsider almost any 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 and warn others not to enter the territory of theirs.
You can see that birds have a language all their own.Most of it has to do with attracting mates and setting up territories.
28.Some scientists believe that most of the time birds'singing is actuallyB.
A.a(chǎn)n expression of happiness      
B.a(chǎn) way of warning
C a way of greeting                        
D.a(chǎn)n expression of anger
29.What is a bird's"territory"?A
A.An area which a bird considers to be its own.
B.A place where families of other species are not accepted.
C.A place where a bird may shout at the top of its voice.
D.An area for which birds fight against each other.
30.Why do birds keep on singing at nesting season?D
A.Because they want to invite more friends.
B.Because they want to find outsiders around.
C.Because their singing helps frighten outsiders away.
D.Because their singing helps get rid of their fears.
31.How does the writer explain birds'singing?B
A.By reporting experiment results.
B.By comparing birds with human beings.
C.By describing birds'daily life.
D.By telling a bird's story.

分析 文章講述了鳥兒的叫聲并非全都是在唱歌,而是一種發(fā)出的警告,警示同伴或是嚇退入侵者.

解答 28.B 細(xì)節(jié)理解題.根據(jù)文章第二段最后一句Their singing is actually a warning to other birds to stay out of their territory可知很多的鳥兒唱歌是警告別的鳥兒.故選B.
29.A 詞義推測(cè)題.從A territory is an area that an animal,usually the male,claims (聲稱) as its own.可知territory是指鳥兒認(rèn)為是自己的領(lǐng)地的地方.故選A.
30.D 細(xì)節(jié)理解題.從you have actually frightened the stranger away without having to fight him.A bird does the same thing.But he expects an outsider almost any time,especially at nesting (筑巢) season.可知它在筑巢期叫的原因是幫助嚇退入侵者.故選D.
31.B 推理判斷題.文章很多地方都拿人與鳥兒進(jìn)行比較,如If so,you have actually frightened the stranger away without having to fight him.可知是與人類比較的,故選B.

點(diǎn)評(píng) 閱讀理解題測(cè)試考生在閱讀基礎(chǔ)上的邏輯推理能力,要求考生根據(jù)文章所述事件的邏輯關(guān)系,對(duì)未說(shuō)明的趨勢(shì)或結(jié)局作出合理的推斷;或根據(jù)作者所闡述的觀點(diǎn)理論,對(duì)文章未涉及的現(xiàn)象、事例給以解釋.考生首先要仔細(xì)閱讀短文,完整了解信息,準(zhǔn)確把握作者觀點(diǎn).

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