单项选择题

According to the text, a proper way to keep a sufficient level of physical fitness is that you need to()

A．exercise any half of the week
B．exercise any two days of the week
C．exercise every other day, three days a week
D．exercise three days a week at most

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单项选择题

If you want to reduce your fat in a specific part, you ()

A．should exercise all the muscles of your body
B．should exercise that specific part of your body
C．should do stomach exercises
D．can do any kind of exercise

单项选择题

You can not judge whether you have exercised too much or not by ()

A．your breathing
B．your heart beating
C．your exercising time
D．whether you are exhausted