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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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 schoolmaster rang up （）

A．the police
B．the rescue party
C．the Air Force
D．the doctor
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