题目内容：
Gunpowder was used extensively in firearms prior to 1990.A in
B around
C from
D before
参考答案：
答案解析：
单选题：Gunpowder was used extensively in firearms prior to 1990.A i
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A in
B around
C from
D before
A in
B around
C from
D before
According m Mr. Phelps, being a good manager means all the f
According m Mr. Phelps, being a good manager means all the following EXCEPTA． pu
My doctor said I should vary my diet more．
My doctor said I should vary my diet more． A．prepare B．cook C．choose D．change
A number of theories have been proposed to explain the situa
A number of theories have been proposed to explain the situation． A．suggested B．
Health education cannot take the place of_________.
Health education cannot take the place of_________.
She shows little regard for the feelings of others and does
She shows little regard for the feelings of others and does exactly what she wan