单选题
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
【正确答案】
C
【答案解析】
此考题为细节题。根据文章最后一句The pilot，therefore，kept the helicopter in the air with only one wheel touching the mountain side．．．就可以断定C正确。
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