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
When things far away seem indistinct, one is probably ______.
A．nearsighted
B．suffering from cataracts
C．astigmatic
D．farsighted
单项选择题
It can be guessed from the passage that the author ______.
A．is in favor of prohibiting passengers' use of electronic devices completely
B．regards it as unreasonable to exercise a total ban during flight
C．hasn't formed his own opinion on this problem
D．has overestimated the danger of electromagnetic interference
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