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
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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
单项选择题
When things far away seem indistinct, one is probably ______.
A．near-sighted
B．far-sighted
C．astigmatic
D．suffering front cataracts
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