单项选择题

The flashing red light served as a （）of danger ahead.

A．predictor
B．caution
C．precaution
D．prevention

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单项选择题
Will you （）my article to find out whether I've made any mistakes

A．look after
B．look through
C．look up
D．look into
单项选择题
When he lived in that remote place, radio was the only means he had to keep （）of current events in the country.

A．account
B．trace
C．record
D．track
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