2. 考研
  3. According to one theory, when the glaciers disappeared, birds ______. This passage supports the belief that ______.

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

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问题 According to one theory, when the glaciers disappeared, birds ______.
This passage supports the belief that ______.
选项 A、exact reasons for migration are not known
B、birds migrate because of changes in temperature
C、the ancestral home of all birds was the tropics
D、glaciers caused birds to migrate
答案A
解析 本题考查应试者对作者态度的理解，文章客观地介绍了关于候鸟迁徙的观点，全篇除了首句Although no one is certain why migration occurs，...，其他地方并没有表露作者观点。所以只能从这儿得出结论：exact reasons for migration are not known.
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