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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单项选择题
The schoolmaster rang up ______.
A．the police
B．the rescue party
C．the Air Force
D．the doctor
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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