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 kind are welcome. Your garden and house are your territory where only your family and friends are welcome. If a stranger should enter your territory and threaten(威脅)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 of their own. Most of it has to do with attracting mates and setting up territories.
小題1: Some scientists believe that most of the time bird’s singing is actually _______.
A．a(chǎn)way of warningB．a(chǎn)n expression of happiness
C．a(chǎn)n expression of angerD．a(chǎn)way of greeting
小題2:What is a bird’s "territory"?.
A．A place where families of other kinds are not accepted.
B．A place where a bird may shut 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 they want to find outsiders around.
C．Because their singing helps frighten outsiders away.
D．Because their singing helps remove their fears.
小題4:How does the writer explain bird’s 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:A
小題1:D
小題1:C
小題1:A
小題1:根據(jù)Some scientists ……because they are happy.因為他們高興，所以選A，一個高興的表情。
小題2:根據(jù)A territory is an area……claims(聲稱)as its own.聲稱是它自己的，選D，鳥認為是屬于它自己的地方。
小題3:根據(jù)especially at nesting(筑巢)season.……and it is usually enough to keep an outsider away.這一段可知通過這一手段足可以讓外人遠離。所以選C，因為他們的歌聲有助于嚇跑外來者。
小題4:最后一段把鳥類的歌聲比作人類的語言，可知選項A,把鳥類同人類進行對比，最符合題意。
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