题目内容：

Everyone knows that exercise is important. Doctors say it’s good for us. It makes our bodies strong. Children who often exercise are more alert(灵活的). This means they do better in tests and school work 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. You’d better do exercise twice a week. Thirty minutes each time is enough.

Exercise must 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.The writer tells us that we all need to _______.

A、drink  B、sleep  C、exercise  D、work

2.People do sports to make them _______.

A、clever and strong   B、clever and weak

C、fast and clever   D、fat and strong

3.We’d better spend about ______ in taking exercise every week.

A、thirty minutes B、an hour

C、210 minutes    D、150 minutes

4.Which of the following sports in NOT mentioned(提及) in the passage?

A、Fishing.  B、Swimming.  C、Running.  D、Walking.

5.The underlined words in the passage mean _______.

A、商务中心  B、健身中心

C、购物中心  D、医疗中心