求助英语题完形填空
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Scientists have always wanted to know more about the universe.
Years ago they knew many things about the moon. They knew how big it was and how far away it was
from the earth. But they wanted to know more about it. They thought the best way was to send men to the
moon.
The moon is about 384,000 kilometers away from the earth. A plane cannot fly to the moon because the
air reaches only 240 kilometers'away from the earth. But something can fly even where there is no air. That
is a rocket.
How does a rocket fly? There is gas in the rocket. When the gas is made very hot inside the rocket, it will
rush out of the rocket, pushing the rocket up into the sky. Rockets can fly far out into space. Rockets with
men in them have been to the moon. Several rockets without men in them have flown to another planet much
farther away than the moon. One day rockets may be able to go to any place in space.
Years ago they knew many things about the moon. They knew how big it was and how far away it was
from the earth. But they wanted to know more about it. They thought the best way was to send men to the
moon.
The moon is about 384,000 kilometers away from the earth. A plane cannot fly to the moon because the
air reaches only 240 kilometers'away from the earth. But something can fly even where there is no air. That
is a rocket.
How does a rocket fly? There is gas in the rocket. When the gas is made very hot inside the rocket, it will
rush out of the rocket, pushing the rocket up into the sky. Rockets can fly far out into space. Rockets with
men in them have been to the moon. Several rockets without men in them have flown to another planet much
farther away than the moon. One day rockets may be able to go to any place in space.
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