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 plane succeeded in carrying the boy on board with ______ in the air.
A．one wheel
B．three wheels
C．two wheels
D．four wheels
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
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