单项选择题

We should take good care of our eyes （）

A．only when we cannot see perfectly
B．only when we can see well
C．even if we can see well
D．only when we realize how important our eyes are

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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
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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