Before a new type of airplane goes into service, every part of it is tested agai
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Before a new type of airplanegoes into service, every part of it is tested again and again. But there aretwo tests that are more important than all the others. The first is called the“tank testお”. A modern airplane must fly very high in the sky. Air must bepumped into the plane so that the passengers can breathe. The metal structure(结构) of the plane has to be verystrong for this reason. When the plane is filled with air, the air pressesagainst the skin of the plane inside. The pressure (压力) on a small window is like ahuge 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, theplane is lowered into a huge tank or container of water. Then it is filled withair. The pressure inside the plane is greater than it ever will be when it ishigh up in the air. Finally, there is an explosion. This does not cause so muchdamage inside the water tank as it would anywhere else. Engineers can discoverwhich part of the plane has broken. Then that part is made stronger.
The most dangerous test happenswhen the new plane is going through test flights in the air. The test pilotmust find out exactly what happens when the engines (发动机) are all shut off atonce. The plane begins to fall like a stone. It is the pilot's job to find outhow he can get control of the plane again. These two tests are examples of how planesare made safe before they ever carry passengers.
1. By doing the “tank test”, theengineers can find out
A. the amount of air in the plane
B. the strength of the plane structure
C. the pressure inside and outside the plane
D. the power of the airplane engines
2. What will happen to the plane under the “tank test”?
A. It will be broken.
B. It will he made stronger.
C. It will be filled with water.
D. It will be tested by pilots.
3. According to the text, why are test flights most dangerous?
A. The plane may explode in the air.
B. The pilot may lose control of the plane.
C. The engines may be damaged.
D. Too much air may get into the plane.
4. What might be the most suitabletitle for the text?
A. TwoImportant Tests on Airplanes.
B. The Importance of Flying Safely.
C. The Danger of Testing Airplanes.
D. How Airplanes Are Made and Tested.
试题答案
答案：1B2A3B4A
解析：1. B。考查考生对短文中细节信息的掌握情况。在对Tank Test进行总结时，作者说到Engineers can discoverwhich part of the plane has broken．Then that part is made stronger，也就是说：通过试验发现飞机结构(强度)上的问题。 2. A。考查考生对短文中细节信息的掌握情况。短文中明确说到Finally，there is an explosion，也就是说：试验的结果一定是飞机爆炸。 3. B。考查考生对短文中细节信息的掌握情况。短文第三段的大部分内容说明了试验飞行最为危险的原因： The test pilot mustfind out exactly what happens when the engines are all shut off at once． The plane begins to fall like astone．It is the pilot’s jobto find out how he can get control of the plane again，这样很容易会导致失控。 4. A。考查考生对短文主旨要义的理解情况。短文首段即点明了全文的中心内容：两项最为重要的实验。
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