根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 Have you ever wondered why birds sing? 1After al

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
Have you ever wondered why birds sing? 1 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.
2 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 won. Only he and his family are welcome there. 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. 3 If so, you have actually scared the stranger away without having to fight him. 4 But he expects an outsider almost all the 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.
5 Most of it has to do with attracting males and setting up territories.A．A bird does the same thing.B．Maybe you thought that they were just happy.C．Shouting loudly is just like a bird's screaming.D．You can see that birds have a language all their own.E. Probably this would be enough to frighten him away.
F. However they sing most of the time for a very different reason.
G. So, just like human beings, birds sing for almost the same reasons.B

(答案→)B 解析：此题型为补全对话。兼有完型填空和情景对话的特点。首先，需要在空白处填上适当的，也就是符合语境的句子，换句话说，句子需要和它紧挨着的前后两句有紧密的衔接关系。首先，可根据句子意义的相识性和关键词索引等对答语进行归类。第一类：B.D第二类：F.G第三类：A.C.E根据此方法：【小题1】B考察上下文理解和句意完整。根据空白句在句意上对上一句内容的进行补充，故可以推出B【小题2】F考察上下文理解和句意完整。根据空白句在句意上对上一句内容的进行补充，作者上句提到 birds do sing some of the time just ,则此处为表转折：However they sing most of the time for a very different reason. ，推出F【小题3】E考察上下文理解和句意完整。根据下句中的关键词scared away，此处也应有相同的frighten away，推出E【小题4】A考察上下文理解和句意完整。根据A选项的关键词it，下文中的he显然替代上句小鸟 故选A【小题5】D考察上下文理解和句意完整。根据上句和空白句信息的关联性，空白句中的shout和上文中的sing loudest 方能推出D

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