Running is good for our health. But running too much may be bad for us. It could make our life shorter. They said too much running can damage your heart. Runners can get heart disease. Runners can get heart disease as people without any exercise.

They looked at the health of 3,300 runners. Most of them ran over 30 kilometers（公里）a week. Marathon（马拉松）runners had hard parts in their hearts. A doctor started running in 1967， but now he is sad. He ran 60 kilometers every week. He thought his heart was strong. Now he has heart problems. He said we should exercise, but not too much.

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1.____is good for our health.

A Running too much

B Eating too much

C Running

D Smoking

解析：选C。C 细节理解题。根据第1段第1句Running is good for our health.可知，故选C。

2.Too much running could damage your______.

A feet

B heart

C head

D hands

解析：选B。B 细节理解题。根据第1段第4句They said too much running can damage your heart.可知，故选B。

3.How many kilometers did the doctor run every week?

A 60

B 30

C 42

D 33

解析：选A。A 细节理解题。根据第2段第第5句He ran 60 kilometers every week.可知，故选A。

4.The underlined word “exercise” means______in Chinese.

A 作业

B 练习

C 锻炼

D 兴奋的

解析：选C。C 语义猜测题。根据根据文中running等词可知exercise理解为“锻炼”符合文章主旨，故选C.

5.What is the best title for the passage?

A Running

B Running too much may not be a good thing

C Exercising

D Running damages your heart

解析：选B。B 文章标题题。AC两项表述太泛，D项太绝对，B项“跑太多未必是好事”契合文章主旨，故选B。