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  3. 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 mo

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 mo

admin2013-05-22  51
问题     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.
What will happen to the plane under the "tank test"?
选项 A、It will be broken.
B、It will be made stronger.
C、It will be filled with water.
D、It wilt be tested by pilots.
答案A
解析 第二段提到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.即可判断，通过宽气加压使飞机爆炸来检测出飞机的薄弱部分，这是tank test的目的，因而A选项表明了tank test的结果，最合题意。B选项It will be made stronger是测试之后所要做的事。题干中的under the“tank test”是指在测试进行当中，因此不可选B。
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