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Even if you are a good high-jumper, you ...

Even if you are a good high-jumper, you can jump only about seven feet off the ground. You cannot jump any higher because the earth pulls you hard. The pull of the earth is called gravity.

You can easily find out the pull of the earth. If you weigh yourself, you will know how much gravity is pulling you.

Since there is gravity, water runs down hill. When you throw a ball into the air, it falls back down. Because of gravity, you do not fall off the earth as it whirls (旋转) around.

Then, can we get away from the earth and go far out into space? Now you can do it, because spaceships have been invented. Then spaceship will go so fast that it can escape (逃出) the earth’s gravity and carry you into space.

1.In this passage, the word “gravity” means.

A. the pull of everything.

B. the force of attraction(吸引) among objects.

C. the force which attracts objects towards the centre of the earth

D. the force which attracts the earth towards the sun.

2. When you slip(滑) you always fall to the ground because

A. the earth always turns round.

B. the earth has gravity

C. the earth’s gravity is greater than your weight.

D. you are careless.

3. Gravity is strong that

A. it can throw a ball into the air.

B. it makes you jump only seven feet.

C. it can let you fly away from the earth.

D. it can keep everything on earth.

4. Because of gravity,

A. water flows everything.

B. we can go everywhere by ship.

C. water always flows downwards.

D. fish can live in water.

 

1.C 2.B 3.D 4.C 【解析】 试题分析:本文介绍了地球的吸引力-重力;以及重力表现的一些现象。 1.C考查细节理解题。根据第一段最后一句The pull of the earth is called gravity.可知gravity是地球的拉力,即重力。故选C。 2.B考查综合理解题。根据对第三段一二句Since there is gravity, water runs down hill. When you throw a ball into the air, it falls back down(由于有了重力,水从山上往下流。当你向空中扔球,它落回来。)的理解;可知当你从高处滑的时候,你总是滑回地面的原因是地球的重力。 3.D考查细节理解题。根据第三段最后一句Because of gravity, you do not fall off the earth as it whirls (旋转) around.(由于重力原因,当地球旋转时你不会从地球上掉下去。)可知选D。 4. 考点:考查科普类阅读。
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