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问题

The author states that birds left the tropics because ______.A.there was not enough food t

The author states that birds left the tropics because ______.

A.there was not enough food there in the winter

B.there were too many birds

C.there were too many glaciers

D.there was too much daylight

请帮忙给出正确答案和分析,谢谢!

发布时间:2020-05-05
参考答案

正确答案:B
B[注释] 本题依据是第二段前两句,关键词语是overpopulated,意思是“数量过多”。

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