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【单选题】

Twenty minutes of (vigorous) exercise every day is very (effect) in (helping) a person to (maintain) physical fitness.
A．vigorous

B．effect
C．helping
D．maintain

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根据网考网移动考试中心的统计，该试题：

3%的考友选择了A选项

64%的考友选择了B选项

3%的考友选择了C选项

30%的考友选择了D选项

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