单项选择题

If you keep on learning like this, you will soon become ______ at many complex skills.

A．persistent
B．proficient
C．consistent
D．sufficient
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单项选择题
This book gives you ______ into the customs and habits of the Aboriginal.
A．insights
B．presentations
C．revelations
D．specifications
单项选择题
We are now quite different from ______ human beings.
A．prime
B．primitive
C．primary
D．preliminary
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