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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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 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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