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【单选题】

Walking is believed to be one of the best ways for a person to ______ healthy.
A．reserve

B．preserve
C．stay
D．maintain
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根据网考网移动考试中心的统计，该试题：

8%的考友选择了A选项

21%的考友选择了B选项

59%的考友选择了C选项

12%的考友选择了D选项

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