阅读理解。

     Everyone knows that exercise is important. We all need to exercise. Doctors say it is good for

us. It makes your heart and body strong. Children who often exercise are more alert (灵活的).

     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's best to exercise twice each week. Thirty minutes each time is enough. Try all

kinds of things until you find one, two or even three sports that feel right for you.

    You can exercise at fitness centers. They have a lot of equipment (设备) there. The equip-

ment will help exercise your arms, legs and other parts of your body to make you fit. Some people

buy equipment for their homes. But it is very expensive.

     Exercising can be fun. Friends can exercise together at afitness center, or they can play

sports together. How do you exercise?

1. In the text, the writer tells us that we all need to_______. 

A. drink    

B. sleep    

C. exercise   

D. work

2. Which of the following sports is NOT mentioned in the text? 

A. Fishing.    

B. Running.    

C. Swimming.    

D. Walking.

3. Doctors say exercising makes your body_______.  

A. healthy    

B. fat    

C. sick    

D. weak

4. _______ is enough for exercising.

A. Once a week    

B. Twice a week

C. Three times a week    

D. Once a day

5. The phrase"fitness centers" in the text means "_______".    

A. 商务中心    

B. 健身中心    

C. 购物中心    

D. 医疗中心