单项选择题


A．useful
B．reliable
C．necessary
D．exciting
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单项选择题
The percentage of cocaine brought through the coast has increased by ______.
A．10%
B．50%
C．60%
D．70%
单项选择题
What is the decisive factor in future competition between nations
A．Oil.
B．Technological skill.
C．Natural resources.
D．Education.
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