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阅读理解，阅读下列短文，然后从A、B、C、D四个选项中选出能回答所提问题或完成所给句子的最佳选项。
Everyone knows that exercise is important．We need to exercise．Doctors say it is good for us．It keeps our bodies strong．
When the daytime comes, we must get up．This is the time for exercise．Exercise means doing things with the body．There are many ways to exercise．You can walk, run, swim, skate, or play ball games．Make sure you exercise in the following ways：you have to like what you’re doing．Exercise enough-but not too much．It is good to exercise twice each week．Thirty minutes each time is enough．Try all kinds of things until you find one, two or three sports that feel right for you．
Exercise can be fun．Friends can exercise together at fitness center, or they can play sports together．How do you exercise?
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