单项选择题

Having two eyes, instead of one, is particularly useful for（）

A．seeing at night
B．seeing objects far away
C．looking over a wide area
D．judging distances

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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．two wheels
C．three wheels
D．four wheels
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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