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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本试题收录于：公共英语二级笔试题库公共英语（PETS）分类

公共英语二级笔试

公共英语（PETS）

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