This is how a rocket works. It is not made of rubber like a balloon, of course. It is made of metal. The metal must not be heavy but it must be very strong. There is gas inside the rocket which is made very hot. When it rushes out of the end of the rocket, the rocket is pushed up into the air.
Rockets can fly fat out into space. Rockets with men inside them have already reached the moon. Several rockets, without men inside them, have been sent to other worlds much farther away. One day rockets may be able to go anywhere in the space.
练习:
1. What color is the sky?
A) It is blue.
B) It is white.
C) It is grey.
D) It has no color.
2. When an airplane flies too high,
A) the air will be too thin to support its wings.
B) the air will become thicker.
C) the air will exert pressure on it.
D) the air will disappear in no time.
3. A rocket can fly to the moon because
A) it looks like a balloon.
B) it is much lighter than an airplane.
C) it doesnt have wings.
D) it works like an untied balloon.
4. Which of the following statements about a rocket is NOT true?
A) It can fly when there is no air.
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