单项选择题

We derive information mainly from the Internet.()

A. deprive
B. obtain
C. descend
D. trace

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单项选择题

Gunpowder was used extensively in firearms prior to 1990.()

A. in
B. around
C. from
D. before

单项选择题

This play is so boring that I feel a bit sleepy.()

A. interesting
B. exciting
C. lazy
D. dull

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