单项选择题

The language experts believe that the ______ age for learning a foreign language is 6 years old.

A．conceptual
B．considerate
C．optimal
D．component
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单项选择题
The evil manners would be ______ root and branch due to the forceful action taken by the local government.
A．exterminated
B．exemplified
C．facilitated
D．emitted
单项选择题
It is doubtful whether anyone can be a truly ______ observer of events.
A．inadequate
B．impassive
C．genius
D．impartial
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