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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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.
单项选择题
The word Proteus is closest in meaning to ______.
A．flexibility
B．diversity
C．variety
D．multiplicity
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