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
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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
People who are farsighted suffer from just the opposite problem. The word suffer in this sentence refers to ______.
A．experience
B．react
C．feel pain
D．imagine
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