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 the earth's gravity and carry you into space.

1.If you are a good high jumper, you can jump far higher than seven feet high.

2.You can know how much gravity is pulling you by weighing yourself.

3.Because of gravity, the water runs up hill and the balls back if you throw it into the air.

4.We can escape the earth's gravity by spaceship because it can travel very fast.

5.The Chinese meaning of "gravity" is "重力".

Answer

1.B

2.A

3.B

4.A

5.A

【解析】

本文介绍了地球的引力，以及地球引力表现的一些现象。

1.

细节理解题。根据短文开头“Even if you are a good high jumper, you can jump only about seven feet off the ground.”可知即使你是一名出色的跳高者你也不能跳离地面高于七英尺，故填B。

2.

细节理解题。根据第一段“If you weigh yourself, you will know how much gravity is pulling you.”可知称自己的体重可以知道地球对自己的引力是多少，故填A。

3.

细节理解题。根据第二段“Since there is gravity, water runs down hill. When you throw a ball into the air, it falls back down. ”可知水从山上流下来而不是流上去，故填B。

4.

细节理解题。根据最后一段“Then spaceship will go so fast that it can escape the earth's gravity and carry you into space.”可知因为宇宙飞船飞行速度快，我们可以乘坐宇宙飞船逃脱地球引力。故填A。

5.

词义猜词题。根据“The pull of the earth is called gravity. ”及“If you weigh yourself, you will know how much gravity is pulling you.”可知地球对我们的引力就是我们的重量，所以gravity称为，地球引力，重力，故填A。