职称英语考试

试题来源：职称英语模拟题-综合类-阅读理解

Rockets in the Sky

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

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

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

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

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

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

This is how a rocket works. It is not made ofrubber like a balloon, of course. It is made of metal. The metal must not beheavy but it must be very strong. There is gas inside the rocket which is madevery hot. When it rushes out of the end of the rocket, the rocket is pushed upinto the air.

Rockets can fly fat out into space. Rocketswith men inside them have already reached the moon. Several rockets, withoutmen inside them, have been sent to other worlds much farther away. One dayrockets 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 itswings.

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 arocket 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.

试题出处：http://www.examtiku.com/shiti/161815789.html
网考网参考答案：D、A、D、D、C
网考网解析：进入考试题库查看解析
大数据分析：根据网考网与考试题库的统计，该试题：
6%的考友选择了A选项
66%的考友选择了B选项
8%的考友选择了C选项
20%的考友选择了D选项
考友解析与评论：
 · 为什么选这个，有没有大神解答一下
 · 这题答案有争议，我认为选D、A、D、D、C
 · 我全答错了