单项选择题

The main purpose of this passage is to ______.

A．encourage people to run
B．describe a popular activity
C．make fun of runners in costume
D．give reasons for the popularity of footraces
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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 dell
D．only when we realize how important our eyes are
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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