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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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.
单项选择题
Why does further study become indispensable
A．People want to do more jobs.
B．People want to attain this extraordinary level of education.
C．People would not rest on the past achievements.
D．What we know becomes obsolete.
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