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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单项选择题
The underlined words suffer from in the third paragraph probably means ______ .
A．experience
B．imagine
C．feel pain
D．are affected with
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