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
Heavy rains were causing inundation and much damage throughout the country.
A．much inconvenience
B．serious concern
C．overflow of water
D．human misery
单项选择题
Educational development is bound up with economic progress.
A．in accordance with
B．consistent with
C．independent of
D．closely related to
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