单项选择题

The underlined word "land" in the last paragraph probably means______.

A．keep for some time
B．successfully get
C．immediately start
D．lose regretfully
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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
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
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