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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 ______.
admin
2009-07-15
31
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。
转载请注明原文地址:https://jikaoti.com/ti/OGlsFFFM
本试题收录于:
公共英语二级笔试题库公共英语(PETS)分类
0
公共英语二级笔试
公共英语(PETS)
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