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【单选题】

We find that some birds ______twice a year between hot and cold countries.

A、transfer
B．migrate
C．commute
D．mobilize
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根据网考网移动考试中心的统计，该试题：

14%的考友选择了A选项

65%的考友选择了B选项

9%的考友选择了C选项

12%的考友选择了D选项

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