单项选择题

For ten years the problem about the water has not been solved, we came to think that it has been a ______ problem in this area.

A．perpetual
B．persuasive
C．picturesque
D．possessive
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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
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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