单选题：Most of the migratory bird no longer fly across Afghanistan

题目分类：理工类
题目类型：单选题
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题目内容：

Most of the migratory bird no longer fly across Afghanistan to Pakistan and India because ________. A．A　they change their route from time to time
B．B　some birds have collapsed while flying
C．C　they have been threatened by the bombs dropped on the country
D．D　they are scared by the big animals in the mountains

参考答案：

答案解析：

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