2021甘肃专升本考试英语模拟试卷——阅读理解（2）

Directions: There are four passages in this part. Each passage is followed by five questions or unfinished statements. For each of them there are four suggested answers marked A, B, C and D. Choose the best answer to each question.

Passage 2

Questions 6 to 10 are based on the following passage.

Before a new airliner goes into service, every part of it is tested again and again. But there are two tests more important than all the others. One of them is very strange and the other is very dangerous.

The first of these is called the “tank test”. A modern airliner must fly at very high altitudes. Air must be pumped into the plane so that the passengers can breathe. The metal structure of the plane has to be very strong for this reason. When the plane is filled with air, or “pressurized”, the air presses against the skin of the plane inside. The pressure on a small window, for example, is like a huge, giant foot that is trying to get out. If a small part of the plane were to crack, the plane would explode in the sky. This is what happened to the first

Comets (彗星). In order to test the structure of the plane, it is lowered into a huge tank of water. Then it is filled with air. The pressure inside the plane is greater than it ever will be when it is in the air. Finally, there is an explosion. This does not cause so much damage inside the water tank as it would anywhere else. Engineers can discover which part of the plane has cracked. This part will be made stronger.

The most dangerous test happens when the new plane is going through test flight in the air. The test pilot must find out exactly what happens when the engines are all shut off at once. He takes the plane up very high. Then he shuts the engines off. The plane begins to fall like a stone. It is the pilot’s job to find out how he gets control of the plane again. These two tests are examples of how planes are made safe before they ever carry passengers.

　　6. The purpose of the tank test is to find out ________.

　　A. how much air can be pumped into a plane

　　B. how much air passengers need to breathe at certain altitudes

　　C. what would happen if the plane crashed in the water

　　D. if there are any weak parts in the plane that would burst under pressure

　　7. It can be inferred that during the test, ________.

　　A. water is pumped into the plane instead of air

　　B. more air is pumped into the plane than usual

　　C. water exerts great pressure on the skin of the plane

　　D. the weaker parts receive greater pressure

　　8. The test is carried out under water because ________.

　　A. the pressure of water is greater than air

　　B. the first Comets crashed in the water

　　C. there is less damage when the explosion happens under water

　　D. this is the only way engineers can find out which part has cracked

　　9. Why the second important test which the author refers to is the most dangerous one is probably that ________.

　　A. the metal structure of the plane is not very strong

　　B. the new plane will explode in the sky

　　C. the test pilot does not know how to get control of the plane

　　D. the plane begins to fall like a stone

　　10. This passage is mainly about ________.

　　A. the plane structure B. the first Comets

　　C. the way of pumping air into the plane D. two important tests
 

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