单项选择题

The plane succeeded in carrying the boy on board with ______ in the air.

A．one wheel
B．two wheels
C．three wheels
D．four wheels
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单项选择题
What is the topic of this paragraph
A．Mountain Climbing.
B．Helicopter.
C．A School Master and His Students.
D．A Rescue Task.
单项选择题
The helicopter could not land because ______.
A．the mountain was too high
B．the mountain-sides were too steep
C．the runway was too narrow
D．the weather was very bad
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