单项选择题

She is very conscientious about her work.

A．worried
B．careful
C．anxious
D．nervous
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Unfortunately war started suddenly in the Middle East on October 6, 1973.
A．broke out
B．broke off
C．broke through
D．broke away
单项选择题
Gunpowder was used extensively in firearms prior to 1990.
A．in
B．around
C．from
D．before
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