问题补充：
We all need to exercise. Doctors say it is good for us. It makes your heart and body strong. It also gives you more energy. And you will feel better yourself. It’s best to exercise twice a week. Twenty minutes each time is enough.
There are many ways to exercise. You can walk, run, play sports, or swim. Many people go to special places to exercise. They are called “fitness centers”. These places have a lot of equitment. Some people buy equitment for their homes. But it is very expensive.
Exercising can be fun. Friends can exercise together at fithess center. Or they can play sports together, how do you exercise?
【小题1】What is the main idea?A．Exercise equitment is expensive.B．Playing sports is a good way to exercise.C．Every person should exercise.D．Fitness centers are popular.【小题2】We should exercise .A．every day B．20 minutes a week.C．twice a weekD．two times a month【小题3】 At fitness cemters,.A．you can buy expensive equitment B．people can do many kinds of exerciseC．it is very expensiveD．exercising is not fun【小题4】Which of these kinds of exercise is not mentioned（提及）in the article?A．Sports .B．Swimming.C．Running.D．Dancing.【小题5】Which of these sentences about exercising is true?A．Exercising is expensive.B．Exercising good for heart.C．Only doctors exercise.D．Friends never exercise together.C
答案：
(答案→)C
解析：
【小题1】根据第一段We all need to exercise. 及下文描述,可知本文的主要思想是说每个人都需要锻炼,故选C.
【小题1】根据第一段It’s best to exercise twice a week. 描述,可知选C
【小题1】根据They are called “fitness centers”. These places have a lot of equitment. 可知在健身中心,人们可以做多种锻炼.故选B
【小题1】根据短文第二段描述,可知在这些锻炼中没有提到跳舞,故选D.
【小题1】根据第一段It makes your heart and body strong. 描述,可知对心脏有好处.故选B.
