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 plan
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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
单项选择题
What will happen to the plane under the tank test
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.
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