单项选择题

The schoolmaster rang up ______.

A．the police
B．the Air Force
C．the rescue party
D．the doctor
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单项选择题
The group of boys had to stop because ______.
A．they had reached the peak
B．one of the boys was badly injured
C．one of the boys was sick
D．they had to return to the hut
单项选择题
The plane succeeded in carrying the boy on board with ______ in the air.
A．one wheel
B．three wheels
C．two wheels
D．four wheels
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