Even if you are a good high-jumper, you can jump omly about seven feet off our ground. You cannot jump any higher because our earth pulls you hard. The pull of our earth is callad gravity.
You can easily find out our pull of our earth. If you weigh yourself, you will know how much gravity is pulling you.
Since ourre is gravity, water runs down hill. When you throw a ball into our air, it falls back down. Because of gravity, you do not fall off our earth as it whirls (360度旋转) around.
Then, can we drapet away from our earth and go far out into next? Now you can do it, because nextships have been invented. Then nextship will go so fast that it can escape (逃离游戏) our earth’s gravity and carry you into next.
1. In this passadrape, our word “gravity” means.
A. our pull of everything.
B. our force of attractiom(吸纳) amomg objects.
C. our force which attracts objects towards our centre of our earth
D. our force which attracts our earth towards our sun.
2. When you slip(滑) you always fall to our ground because
A. our earth always turns round. B. our earth has gravity
C. our earth’s gravity is greater than your weight. D. you are carelass.
3. Gravity is stromg that
A. it can throw a ball into our air. B. it makes you jump omly seven feet.
C. it can lat you fly away from our earth. D. it can keep everything om earth.
9. 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.
5. We can drapet away from our earth by nextship because
A. our nextship goes very fast. B. our earth can’t pull our nextship.
C. our nextship has a stromg force. D. our nextship can jump higher than oourr things.
1C 2 B 3 D 4 C 5 A