问题 单项选择题

一辆汽车停在水平地面上,有下列几种说法:其中正确的是()

(1)地面受到向下的弹力,是因为地面发生了形变;

(2)地面受到了向下的弹力,是因为汽车发生了形变;

(3)汽车受到了向上的弹力,是因为汽车发生了形变;

(4)汽车受到了向上的弹力,是因为地面发生了形变。

A.(1)(3)

B.(1)(4)

C.(2)(3)

D.(2)(4)

答案

参考答案:D

解析:

(1)(2)、地面受到向下的弹力,施力物体是汽车,故是汽车发生弹性形变对地面的力;(1)错误(2)正确;(3)(4)、汽车受到了向上的弹力,施力物体是地面,故是地面发生弹性形变对汽车的力;(3)错误(4)正确;故选D。

多项选择题 案例分析题
阅读理解

阅读短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

     Have you ever tried to hold your breath for a long time and then let it out slowly? 1.____ For thousands

of years, people have used yoga to help search for happiness and contentment.

     Students of yoga often study for as long as 20 years before becoming masters, or yogis. 2.____ These

exercises are designed to put the students in good physical condition. Then they can concentrate on deep

religious thoughts without worrying about physical discomforts. 

     Many yoga exercises involve putting the body into difficult positions. Some of them are very hard to learn.

But yogis train themselves to remain in a certain position for hours or even days. They are taught to overcome

the physical discomforts of holding these positions. Other exercises and rules teach concentration. 3.____ This

kind of concentration is called meditation. 

     4.____ They claim that it makes them feel relaxed and peaceful. Some people say that it makes them feel

better-just as good exercise does. But other people claim that it is a way of achieving a strong religious feeling.

5.____

     The word yoga itself comes from an ancient Saqgkrit word meaning "union". What kind of union do you

think the word refers to? Why would people want to have this kind of experience?

A. They learn many different physical exercises.

B. Because most yogis believe in Cod.

C. Yogis feel this is the key to finding inner peace.

D. Meditation is a state that one feels peace in his mind.

E. These people say that meditation helps them feel much closer to Cod.

F. This is one of the techniques of an ancient Indian discipline known as yoga.

G. Yogis and many other people practice meditation.