问题 名词解释

束水攻沙

答案

参考答案:

束水冲沙法,就是人为地收紧河道,利用水的冲力,冲击河床底部泥沙,从而达到清淤防洪的目的。一般适用于流量较大的河流,如黄河。最早使用这种方法治理黄河的是明朝著名水利工程师潘季驯,后人多采用此方法治黄。

阅读理解

阅读理解。

     You have often looked into a mirror, of course. But you haven't seen the real picture of your face yet.

And why couldn't you see it? When you look into a mirror, you don't see your face as other people see it.

You see a reversed picture. If you close your left eye, your picture closes its right eye. If you touch your

right ear with your right hand, your picture touches its left ear with its left hand.

     If you have two small mirrors, you can see your faces as your friends see it. You hold the two mirrors

at right angles (角度) to each other and look into them. After some practice you will be able to see the real

picture of your face.

    Now close your left eye and your picture closes its left eye too. Touch your right ear with your right

hand and your picture touches its right ear with its right hand! This happens because each mirror reflected

(反射) the picture in the other mirror. So you see a reversed picture of a reversed picture, which, of course,

is the same as the real picture.

1. When you look into a mirror, you couldn't see ______.

A. the picture of yourself

B. your face as others see it

C. the picture of your face

D. the picture of your eyes

2. What does the word reversed mean in this passage?

A. 暂存的

B. 相反的

C. 模拟的

D. 虚拟的

3. According to the first paragraph of the passage, if you close your left eye, your picture in the mirror ______.

A. closes its right eye

B. closes its left eye

C. touches its right ear

D. touches its left ear

4. Which of the following pictures is right according to the second paragraph of the passage?

M = mirror  P = person

5. We can learn something about ______ from the passage.

A. body language

B. Physical Education (体育)

C. optical illusions (视错觉)

D. television invention

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