【单选题】
This passage supports the belief that ______.
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
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根据网考网移动考试中心的统计,该试题:
79%的考友选择了A选项
20%的考友选择了B选项
0%的考友选择了C选项
1%的考友选择了D选项