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
We should take good care of our eyes ______ .
A．only when we can see well
B．only when we cannot see perfectly
C．even if we can see well
D．only when we realize how important our eyes are
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