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）．This means they do better in tests and schoolwork than those who don't exercise．

    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 thing 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 equipment will help exercise your arms, legs and other parts of 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 a fitness center, or they can Play sports together．How do you exercise?

根据短文内容，选择最佳答案。

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 in the text?

       A．Fishing                  B．Running                C．swimming            D．Walking

3．The words“fitness centers”in Chinese is___________．

    A．商务中心           B．健身中心              C．购物中心              D．医疗中心

4．The best way to exercise is do it __________．

A．once a week           B．sometimes              C．twice a month               D．twice a week

5．How long should we do exercise is do it ___________．

A．An hour            B．Half an hour             C．20 minutes            D．40 minutes