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
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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