Have you ever wondered why birds sing? Maybe you thought that they were just happy．After all，yo.

小题1:D

小题2:B

小题3:D

试题分析：本文是一篇科普类的短文，主要分析了鸟儿唱歌的不同的原因。

小题1:D 细节题。根据文章第二段最后一句Their singing is actually a warning to other birds to stay out of their territory可知很多的鸟儿唱歌是警告别的鸟儿，故D正确。

小题2:B 细节题。根据文章第三段前3行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 welcome there．No other families 0f the same species(物种)are welcome．说明B正确。

小题3:D 细节题。根据文章第四段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．可知在筑巢季节，鸟儿叫主要是想吓走外来者。故D正确。

点评：本文是一篇科普类的短文，主要分析了鸟儿唱歌的不同的原因。本文考查细节题为主，细节题可以在文章中直接找到与答案有关的信息?或是其变体。搜查信息在阅读中非常重要它包括理解作者在叙述某事时使用的具体事实、数据、图表等细节信息。在一篇短文里大部分篇幅都属于这类围绕主体展开的细节。做这类题一般采用寻读法?即先读题，然后带着问题快速阅读短文，找出与问题有关的词语或句子，再对相关部分进行分析对比，找出答案。