2. 外语
  3. According to one of the theory, when glaciers disappeared, birds______. This passage supports the belief that ______.

According to one of the theory, when glaciers disappeared, birds______. This passage supports the belief that ______.

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问题 According to one of the theory, when glaciers disappeared, birds______.
This passage supports the belief that ______.
选项 A、exact reasons for migration are not known
B、glaciers caused birds to migrate
C、the ancestral home of birds was the tropics
D、birds migrate because of changes in temperature
答案A
解析 作者在文章开头讲到：没有人肯定鸟类迁移的原因。接着他客观地介绍了三种解释理论，并没有表示他本人相信哪一种。据此推断他认为还没有搞清楚确切原因。
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