单项选择题

When things far away seem indistinct, one is probably ______.

A．nearsighted
B．suffering from cataracts
C．astigmatic
D．farsighted
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单项选择题
The main idea of this passage is ______.
A．a new rule for all airlines
B．the defects of electronic devices
C．a possible cause of aircraft crashes
D．effective safety measures for air flight
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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