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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  27
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 might be the most suitable title for the text?
选项 A、Two Important Tests on Airplanes
B、The Importance of Flying Safely
C、The Danger of Testing Airplanes
D、How Airplanes Are Made and Tested
答案A
解析 这道题要求选出适合本文的标题，属于考查掌握全文主旨大意能力的题。根据全文大意，主要讲了两种测试的内容，因此A选项为本题答案。B和C选项均不是本文主要讨论的话题，而D选项则犯了概括过宽的错误，因为本文并未涉及飞机制造和测试的全过程。
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