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.

　　68、By doing the tank test, the engineers can find out _______.（本题分值：2分）【正确答案】 B

　　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

　　69、What will happen to the plane under the tank test?（本题分值：2分）【正确答案】 A

　　A. It will be broken.

　　B. It will be made stronger.

　　C. It will be filled with water.

　　D. It will be tested by pilots

　　70、According to the text, why are test flights most dangerous?（本题分值：2分）【正确答案】 B

　　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.

　　71、What might be the most suitable title for the text?（本题分值：2分）【正确答案】 A

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