单项选择题

What is the main reason that the man runs every day

A．To think out some difficult problems.
B．To do some cross-country running,
C．To finish a course in physical trainning.
D．To keep fit and healthy.

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单项选择题

单项选择题

What is the main reason that the man runs every day 您的浏览器不支持 audio 元素。