Have you ever wondered why birds sing? Maybe you thought that they were just hap

Have you ever wondered why birds sing? Maybe youthought 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 thetime 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 tostay out of their territory

Do you know what a “territory” is? A territory is anarea that an animal，usually the male，claims(声称)as its own．Only he and his family are welcome there．No other families 0f the same species(物种)are welcome．Your yard andhouse are your territory where only your family and friends are welcome．If a stranger should enter your territory and threatenyou，you might shout．Probably this would be enough to frighten him away．

If so，you have actually scaredthe stranger away without having to fight him．A birddoes 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 screamingis what we call a bird’s song，and it is usually enoughto keep an outsider away．

Birds sing loudest in the spring when they are tryingto 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 settingup territories．

1.Some scientists believe that most of the time birds’singing is actually．

A．an expressionof happiness

B．a way ofgreeting

C．an expressionof anger

D．a way ofwarning

2.What is a bird’s “territory”?

A．A place wherefamilies of other species are not accepted．

B．An area whicha bird considers to be its own

C．an area forwhich birds fight against each other．

D．A place wherea bird may shout at the top of its Voice．

3.Why do birds keep on singing at nesting season?

A．Because theywant to invite more friends

B．Because theirsinging helps get rid of their fears．

C．Because theywant to find outsiders around．

D．Because theirsinging helps frighten outsiders away．

试题答案

【答案】

1.D

2.B

3.D

【解析】

试题