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

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

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

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