阅读下列短文，从每小题所给的A、B、C、D四个选项中选出一个最佳选项。

    Do you know how to do sports? You may think it's a funny1. Does everyone know how to play sports in right ways? I don't think so. Here is some advice. For sports, morning is a 2time than evening. Doing3 before you work or study will make you excited all day. If you do lots of sports before you go to 4, you will find it's 5 to fall asleep（入睡）. And also, don't do sports after dinner at once. It's bad for your 6 . Do a warm-up before doing sports and don't 7with hard sports. The good sports for the young and the old are8. For example, running   9 isn't good for old people. Try to choose right time to10right sports. It will make you healthy.