阅读理解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(声称)as its own. Only he and his family are wele there. No other families of the same kind are wele. Your garden and house are your territory where only your family and friends are wele. If a stranger should enter your territory and threaten(威胁)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.1.Some scientists believe that most of the time bird’s singing is actually _______.A.away of warningB.an expression of happinessC.an expression of angerD.away of greeting2.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 voiceC.An area for which birds fight against each other.D.An area which a bird considers to be its own.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.4.How does the writer explain bird’s singing?A.By paring birds with human beings.B.By reporting experiment results.C.By describing birds’ daily life.D.By telling a bird’s story.
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ADCA解析1.根据Some scientists ……because they are happy.因为他们高兴，所以选A，一个高兴的表情。2.根据A territory is an area……claims(声称)as its own.声称是它自己的，选D，鸟认为是属于它自己的地方。3.根据especially at nesting(筑巢)season.……and it is usually enough to keep an outsider away.这一段可知通过这一手段足可以让外人远离。所以选C，因为他们的歌声有助于吓跑外来者。4.最后一段把鸟类的歌声比作人类的语言，可知选项A,把鸟类同人类进行对比，最符合题意。