根據(jù)短文內(nèi)容，從短文后的選項中選出能填入空白處的最佳選項。選項中有兩項為多余選項。
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(聲稱) 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.


【小題1】B
【小題2】F
【小題3】E
【小題4】A
【小題5】D

解析試題分析：此題型為補(bǔ)全對話。兼有完型填空和情景對話的特點。首先，需要在空白處填上適當(dāng)?shù)模簿褪欠险Z境的句子，換句話說，句子需要和它緊挨著的前后兩句有緊密的銜接關(guān)系。首先，可根據(jù)句子意義的相識性和關(guān)鍵詞索引等對答語進(jìn)行歸類。第一類：B.D第二類：F.G第三類：A.C.E
根據(jù)此方法：
【小題1】B考察上下文理解和句意完整。根據(jù)空白句在句意上對上一句內(nèi)容的進(jìn)行補(bǔ)充，故可以推出B
【小題2】F考察上下文理解和句意完整。根據(jù)空白句在句意上對上一句內(nèi)容的進(jìn)行補(bǔ)充，作者上句提到 birds do sing some of the time just  ,則此處為表轉(zhuǎn)折：However they sing most of the time for a very different reason. ，推出F
【小題3】E考察上下文理解和句意完整。根據(jù)下句中的關(guān)鍵詞scared away，此處也應(yīng)有相同的frighten away，推出E
【小題4】A考察上下文理解和句意完整。根據(jù)A選項的關(guān)鍵詞it，下文中的he顯然替代上句小鳥 故選A
【小題5】D考察上下文理解和句意完整。根據(jù)上句和空白句信息的關(guān)聯(lián)性，空白句中的shout和上文中的sing loudest 方能推出D
考點：任務(wù)型閱讀，句型劃分和句意判斷
點評：要做好該類型題，需用歸類法&信息關(guān)聯(lián)法&經(jīng)驗法&關(guān)鍵詞法，用已有的句型知識幫助自己做出判斷。試舉一例，以本題為例，用信息關(guān)聯(lián)法解題，4題，根據(jù)上句和空白句信息的關(guān)聯(lián)性，空白句中的it和下句中的he 均指小鳥，環(huán)環(huán)相扣。考生平時多注意這方面的訓(xùn)練。

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