___1____ Maybe you thought that they were just happy. After all, you probably sing or whistle when you are happy.
However, they sing most of the time for a very different reason. ____2___ Some scientists believe that birds do sing some of the time just because they are happy.
Do you know what a “territory” is? A territory is an area that an animal, usually the male, claims(聲稱)as its own. ____3___ 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. 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.__4__.
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. ___5__
A．Only he and his family are welcome there.
B．Most of it has to do with attracting mates and setting up territories.
C．Have you ever wondered why birds sing?
D．Their singing is actually a warning to other birds to stay out of their territory.
E. Have you ever wondered why birds sing?
F. Most of the language is widely used.
G. This screaming is what we call a bird’s song, and it is usually enough to keep an outsider away.

小題1:E
小題2:D
小題3:A
小題4:G
小題5:B

試題分析：本文是對鳥兒鳴叫聲的研究，主要是兩個目的，一個是吸引異性，另外一個是現(xiàn)實主權。
小題1:E 根據(jù)After all, you probably sing or whistle when you are happy.說明當我們開心的時候，我們可能也會唱歌，故前面應該是指唱歌有關的內(nèi)容，故E項符合上下文。
小題2:D 根據(jù)上句However, they sing most of the time for a very different reason.說明鳥兒的歌聲有不同的原因，也許就是警告地方離開自己的領地，故D項正確。
小題3:A 根據(jù)前句A territory is an area that an animal, usually the male, claims(聲稱)as its own領地就是他聲稱屬于他自己的地盤。別人不允許進入，故A正確。
小題4:G 根據(jù)上句he is screaming all the time, whether he can see an outsider or not他一直在尖叫，也許這就是我們所謂的鳥兒的歌聲，實際上是為了警告別的同類離開。故G項正確。
小題5:B 根據(jù)本段第一行說明鳥兒的鳴叫是與吸引異性有關，以及第三段中鳥兒的叫聲是為了警告同類，顯示主權。故B說法符合上下文。
點評：此類文章重在把握上下文之間的邏輯關系，通過前后的意思連貫性及細致性用心的答題，定能完成的很好。
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