单项选择题

The phrase "to a good cause" in line 3 could be best replaced by ______.

A．for a good reason
B．to support a sound principle
C．for a good purpose
D．to protect a wise investment
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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
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
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