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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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
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
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