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
People who suffer from astigmatism
A．have a curable disease in their eyes
B．have eyes that are not exactly the right shape
C．have a difficulty that can be corrected by an operation
D．have an eye difficulty that cannot be corrected by glasses
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