单项选择题

What can you do to ensure that you will stay healthy

A. be assured
B. insist
C. prove
D. secure
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Gunpowder was used extensively in firearms prior to 1990.
A. in
B. around
C. from
D. before
单项选择题
The town is famous for its magnificent church towers.
A. distinguished
B. contemporary
C. specialized
D. specified
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