补全短文。根据短文内容，从短文后的A-F选项中选出适当的选项补全短文。（共5 小题，计5分） 小题1:Is this true? Maybe it is, or we won't be healthy and clever. 小题2:Children of our age need nine hours sleep every day. If we don't go to bed early, we won't have enough sleep. Then we can't think properly and can't do our work properly. We will not be clever. 小题3:This is not good for them. We must go to bed at night when it is dark. The dark helps us to sleep. When the daytime comes, we must get up. This is the time for exercise. 小题4:Exercise keeps a strong body. 小题5:This is very important. Blood takes food to all parts of our body. The brain also needs blood. We think with our blood. We can think better if we keep our body healthy and take exercise. A. The body must have enough sleep． B. Exercise helps the blood (血液) go around inside the body. C. But it’s necessary to take some exercise every day. D. Everyone must go to bed early and get up early. E. If we lack (缺少) exercise, we will become weak. F. Some people go to bed late and get up late.