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According to one of the theory, when glaciers disappeared, birds______. The author states that birds left the tropics because__
According to one of the theory, when glaciers disappeared, birds______. The author states that birds left the tropics because__
admin
2009-07-15
77
问题
According to one of the theory, when glaciers disappeared, birds______.
The author states that birds left the tropics because______.
选项
A、there were too many glaciers
B、there were too many birds
C、there was not enough food there in winter
D、there was too’ much daylight
答案
B
解析
第二段谈到所有现代鸟的故乡都在热带。第二句when the region became overpopulated,many different sorts of birds crowded north,由此可见鸟之所以离开热带地区是因为那里的鸟太多了。
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本试题收录于:
公共英语二级笔试题库公共英语(PETS)分类
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