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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单项选择题
The main idea of this passage is ______.
A．Knowledge of a Computer
B．Importance of a Computer
C．Function of Knowledge
D．Function of Technology
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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