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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单项选择题
A．expensiveB．dearC．invaluableD．valuable
A．expensive
B．dear
C．invaluable
D．valuable
单项选择题
According to the article, families and the whole society benefit from women’s ______.
A．work
B．education
C．effort
D．health
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