阅读理解。
   All of us know exercise is good for us.Enough（充足的）sleep is also good for us.Doctors say people should spend 60 minutes or more doing exercise every day.Exercise can help us look better.It is one of the most important ways to keep our bodies in a healthy weight.Exercise，like jumping，running and swimming，can improve（提高）our immunity.So exercise helps us get less chance（概率更小）becoming ill.Exercise is also good for our mind.It can help us sleep better.It can also make us happy.If you are doing exercise now.Try to keep it on.If you didn't like exercise before，try to start from now on.Different people need different hours of sleep.For primary school（小学）students，doctors say they should sleep for about 10 hours every day.Enough sleep can also improve our immunity and protect us from illness.Enough sleep can keep us happy.It can make us beautiful too because enough sleep can keep our skin perfect.
根据短文内容，第（1）至第（4）小题选择最适合的答案，第（5）小题根据实际情况回答问题。
（1）The underlined word"immunity"means"

A

A

"in Chinese.
A.免疫力
B.体重
C.效率
（2）If a primary school student usually gets up at 7，00 a m.，he or she should go to bed at

B

B

p.m.
A.about 8：00
B.about 9：00
C.about 10：00
（3）Exercise and sleep are good for us because

A

A

.
A.they both protect us from illness
B.they both keep our skin perfect
C.they both keep our bodies in a healthy weight
（4）We can read this passage（短文）in a book about

C

C

.
A.sports
B.food
C.health
（5）How do you keep healthy in your life？

I do exercise and go to bed early every day.

I do exercise and go to bed early every day.