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Have you ever wondered why birds sing? Maybe you thought that they were just happy．After all, you probably sing 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 are welcome．Your house is 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 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．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．
小題1:Some scientists believe that most of the time bird’s singing is actually ______．

A．an expression of happiness	B．a way of warning
C．an expression of anger	D．a way of greeting

小題2:What is a bird’s “territory”?

A．A place where families of other species are not accepted.

B．A place where a bird may shout at the top of its voice．

C．An area for which birds fight against each other．

D．An area which a bird considers to be its own．

小題3:Why do birds keep on singing at nesting season?

A．Because they want to invite more friends．

B．Because their singing helps frighten outsiders away．

C．Because they want to find outsiders around．

D．Because their singing helps get rid of their fears．

小題4:How does the writer explain birds’ singing?

A．By comparing birds with human beings．

B．By reporting experiment results．

C．By describing birds’ daily life．

D．By telling a bird’s story．

小題1:B
小題2:D
小題3:B
小題4:A

試題分析：文章介紹了鳥為什么會唱歌，大部分鳥的歌聲是一種警告，為了保護自己的領地不被外來者侵犯。
小題1:細節題：從第二段的句子：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．可知鳥唱歌是一種警告，選B
小題2:猜詞題：從第二段的句子：A territory is an area that an animal, usually the male, claims (聲稱) as its own.可知這個單詞是“領地”的意思。選D
小題3:細節題：從文章最后一段的句子：This screaming is what we call a bird’s song, and it is usually enough to keep an outsider away.可知在筑巢的時候鳥的歌唱是為了趕走外來者。選B
小題4:細節題：從第一段的句子：After all, you probably sing 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.可知作者解釋鳥的歌唱是把它和人相比較。選A

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