2. 自考
  3. 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 ea

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 ea

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问题     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.  
In this passage, the word "gravity" means______.
选项 A、the pull of everything
B、the force of attraction among objects
C、the force which attracts objects towards the centre of the earth
D、the force which attracts the earth towards the sun
答案C
解析 词语理解题。根据第一段可知，gravity即重力，也就是地球的引力，它可以将地面附近的物体都吸引到地心。C符合题意．故选C。
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