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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单项选择题
______ they have already solved the problem by themselves by now.
A．Increasingly
B．Invariably
C．Presumably
D．Dominantly
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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