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.  
We can get away from the earth by spaceship because______.
选项 A、the spaceship goes very fast
B、the earth can’ t pull the spaceship
C、the spaceship has a strong force
D、the spaceship can jump higher than other things
答案A
解析 事实细节题。根据最后一段最后一句可知，因为太空飞船的速度很快，所以它可以摆脱地球的引力，带人类进入太空。故选A。
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