单项选择题

When things far away seem indistinct (模糊不清), one is probably ______ .

A．near-sighted
B．far-sighted
C．astigmatic
D．suffering from cataracts
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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
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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