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 plane succeeded in carrying the boy on board with ______ in the air.A. one wheel C. three wheelsB. two wheels D. four wheels
A．two wheels
B．four wheels
C．three wheels
D．The plane succeeded in carrying the boy on board with ______ in the air.
E．one wheel
单项选择题
The schoolmaster rang up ______.A. the police C. the Air ForceB. the rescue party D. the doctor
A．the rescue party
B．the doctor
C．the Air Force
D．The schoolmaster rang up ______.
E．the police
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