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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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
Rose asked her elder sister Why is ______ Mother out of work
A．×
B．the
C．our
D．a
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