【题目】Before a new type of airplane goes into service, every part of it is tested again and again. But there are two tests that are more important than all the others.

The first is called the “tank test”. A modern airplane must fly very high in the sky. Air must be pumped into the plane so that the passengers can breathe. The metal structure (结构) of the plane has to be very strong for this reason. When the plane is filled with air, the air presses against the skin of the plane inside. The pressure (压力) on a small window is like a huge foot that is trying to get out. If a small part of the plane were to fail, the plane would explode in the sky. To test the structure of the plane, the plane is lowered into a huge tank or container of water. Then it is filled with air. The pressure inside the plane is greater than it ever will be when it is high up 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 broken. Then that part is made stronger,

The most dangerous test happens when the new plane is going through test flights in the air. The test pilot must find out exactly what happens when the engines (发动机) are all shut off at once. The plane begins to fall like a stone. It is the pilot’s job to find out how he can get control of the plane again. These two tests are examples of how planes are made safe before they ever carry passengers.

1By doing the “tank test”, the engineers can find out ________.

A.the power of the airplane enginesB.the amount of air in the plane

C.the strength of the plane structureD.the pressure inside and outside the plane

2What will happen to the plane under the “tank test”?

A.It will be tested by pilots.B.It will be broken.

C.It will be made stronger.D.It will be filled with water.

3According to the text. why are test flights most dangerous?

A.Too much air may get into the plane.B.The plane may explode in the air.

C.The pilot may lose control of the plane.D.The engines may be damaged.

4What might be the most suitable title for the text?

A.How Airplanes Are Made and TestedB.Two Important Tests on Airplanes

C.The Importance of Flying SafelyD.The Danger of Testing Airplanes

【题目】 Recently, a new study suggests that staying positive through the cold season could be the best defense(抵御) against getting sick.

In an experiment that exposed(暴露)healthy volunteers to a cold of flu virus, researchers found that people with a generally sunny emotion were less likely to fall ill. The findings, published in the journal “Psychosomatic Medicine”, build on evidence that a “positive emotional style” can help defend the common cold and other illnesses.

“People with a positive emotional style may have different immune responses to the virus,” explained Dr Sheldom Cohen of Carnegie Mellon University in Pittsburgh. And when they do get a cold, they may experience their illness as less serious.

Cohen and his colleagues had found in a previous study that happier people seemed less susceptible(易受影响的) to catching a cold, but some questions remained as to whether the emotional quality itself had the effect.

For the new study, the researchers had 193 healthy adults complete standard measures of personality qualities, physical health and “emotional style”.

Those who tended to be happy, energetic and easy-going were judged as having a positive emotional style, while those who were often unhappy and tense had a negative style.

Afterwards, the researchers gave them nose drops containing either a cold virus or a particular flu virus that causes flu-like symptoms. Over the next six days the volunteers reported on any aches, pains, sneeze they had. Cohen and his colleagues found that positive emotions really have the big effect of fighting virus.

1The results of the experiments by researchers suggest that _______.

A.people in excellent spirits are less likely to fall ill.

B.the emotional quality itself has the greatest effect of fighting virus

C.people with a positive emotional style seemed more likely to get ill

D.positive emotional people and negative people response similarly to the virus

2Dr Sheldom Cohen made studies and reached his conclusion by _______.

A.comparing the experimental results of different groups

B.looking into the forms completed by the volunteers

C.collecting data among people with a cold

D.observing the volunteers’ symptoms

3According to the passage, what quality should we develop to fight virus?

A.Clever.B.Hard-working.

C.Optimistic.D.Friendly.

4We can conclude from the passage that _______.

A.positive life can lead to success in one’s career

B.physical health is more important than mental health

C.the happier we are, the less likely we will be to fall ill

D.the more we are together, the happier we will be

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