单项选择题

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.
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单项选择题
By doing the tank test , the engineers 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
单项选择题
What might be the most suitable title for the text
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
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