There is an old English saying. It tells us that we must go to bed early and get up early in the morning. Then we shall be healthy. We shall also be rich and clever. This is true. The body must have enough sleep to be healthy. Children of young age should have ten hours' sleep every night. Children who do not have enough sleep cannot do their work well and they may not be healthy.

The body also needs exercise. Walking, running, jumping and playing games are all exercise. Exercise keeps the body strong. Exercise also helps the blood to move around inside the body. It is very important. Our blood moves to all parts of our body. The head also needs blood. Exercise helps us to think better.

小题1:If we want to be healthy, we must________.

A．eat more

B．sleep more

C．play more

D．go to bed early and get up early小题2:Young children should have ______ hours' sleep every day.

A．ten

B．nine

C．eleven

D．twelve小题3:If children don't have enough sleep, they will not________.

A．work well

B．be clever and healthy

C．eat well

D．A and B小题4:Does exercise help us to think better?

A．Yes, it does.

B．No, it doesn’t.

C．No, it does

D．Yes , it doesn’t.小题5:The body also needs________.

A．sports

B．running

C．exercise

D．playing

数据库文件工资.DBF共有10条记录，当前记录号为5。用SUM命令计算工资总和，如果不给出范围短句，那么命令

A．计算后5条记录工资值之和

B．计算后6条记录工资值之和

C．只计算当前记录工资值

D．计算全部记录工资值之和