2. 考研
  3. According to one theory, when the glaciers disappeared, birds ______. The author states that birds left the tropics because ___

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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