Question

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. The word “gravity” in the passage means “______”.

A. the pull of everything

B. the pull of the earth

C. the pull of the sun

2.Which of the following is not because of gravity?

A. Water runs down hill.

B. We can jump high.

C. A ball falls back down to the ground.

3.We can get away from the earth by spaceship because_______.

A. the spaceship goes very fast

B. the earth is far from the space

C. the spaceship is very light

Answer 1

1.B

2.B

3.A

【解析】

试题分析：本篇文章介绍了重力的作用，及其一些事例。

1.You cannot jump any higher because the earth pulls you hard. The pull of the earth is called gravity.可知重力是指地球的地心引力。故选B。

2. 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.可知只有我们能够跳高，不是因为地心引力。故选B。

3.Then spaceship will go so fast that it can escape (逃出) the earth’s gravity and carry you into space.可知然后飞船将很快能够逃脱地球的地心引力把你送入太空。故选A。

考点：考查科技类阅读。