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 dell
D．only when we realize how important our eyes are
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单项选择题
People who are farsighted suffer from just the opposite problem. The word suffer in this sentence refers to ______.
A．experience
B．react
C．feel pain
D．imagine
单项选择题
People who suffer from astigmatism ______.
A．have an eye difficulty that cannot be corrected by glasses
B．have eyes that are not exactly the right shape
C．have a difficulty that can be corrected by an operation
D．have a curable disease in their eyes
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