21世纪英语报1146期文章翻译

If someone asked you, "What color is the sky?" I expect that you would answer,
"Blue." I am afraid that you would be wrong. The sky has no color. When we see
blue, we are looking at blue sunlight. The sunlight is shining on little bits of
dust in the air.

　　液物We know that there is air all around the world. We
could not breathe without air. Airplanes could not fly without air. They need
air to lift their wings. Airplanes cannot fly very high because as they go
higher the air gets thinner. If we go far enough away from the earth, we find
there is no air.

　　What is the sky? The sky is space. In this space
there is nothing except the sun, the moon and all the stars.

　　Scientists have always wanted to know more about the other worlds in
the space. They have looked at them through telescopes and in this way they have
found out a great deal.

　　The moon is about 384,000 kilometers away from
the earth. An airplane cannot fly to the moon but there is a thing that can fly
even when there is no air. This is rocket.

　　I am sure that you are
asking, "缓轮How does a rocket fly?" if you want to know, get a balloon and then
blow it up until it is quite big. Do not tie up the neck o f the balloon. Let
go! The balloon will fly off through the air very quickly. The air inside the
balloon tries to get out. It rushes out through neck of the balloon and this
pushes the balloon through the air. It does not need wings like an airplane.

　　扰埋信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.
　　
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 doesn’t 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.
B) It can fly
without wings.
C) It is made of strong metal.
D) It is propelled by
burning gas inside it.
　　
5. A rocket is pushed up into the air
when________.
A) hot gas rushes out of its head.
B) it is powered by
gas.
C) hot gas rushes out of its bottom.
D) hot gas rushes out of its
neck.

答案是:1.D 2.A 3.D 4.D 5.C