According to one theory, when the glaciers disappeared, birds ____. The author states that birds left the tropics because _

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问题 According to one theory, when the glaciers disappeared, birds ______.
The author states that birds left the tropics because ______.

选项 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

答案B

解析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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GCT工程硕士（英语）

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