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
People who suffer from astigmatism have ______ .
A．one eye bigger than the other
B．eyes that are not exactly the right shape
C．a difficulty that can be corrected by an operation
D．an eye difficulty that cannot be corrected by glasses
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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