单项选择题


A．about
B．in
C．around
D．on
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单项选择题
A．usefulB．reliableC．necessaryD．exciting
A．useful
B．reliable
C．necessary
D．exciting
单项选择题
The percentage of cocaine brought through the coast has increased by ______.
A．10%
B．50%
C．60%
D．70%
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