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