five hundred people are believed to have drowned.
As many as
B. As much as
C. So many as
D. So much as
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一般地，包过滤防火墙系统不能识别数据包中的用户数据部分。()
在直流调速系统中，对直流电动机运行速度进行控制从而实现运动机构的调速。()
Our school-run factory _____ various kinds of chemical devices last year.
A. turned into
B. turned up
C. turned out
D. turned off
Smoking is not good _____ you because it can affect your health.
A. for
B. at
C. to
D. on
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