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【单选题】

Cold air causes the arteries around the heart to constrict.

A become rigid
B contract
C close
D die
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根据网考网移动考试中心的统计,该试题:

1%的考友选择了A选项

82%的考友选择了B选项

10%的考友选择了C选项

7%的考友选择了D选项

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