单项选择题

It was clear that the storm______his arrival by two hours.

A．retarded
B．retired
C．refrained
D．retreated
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单项选择题
Business in this area has been______because prices are too high.
A．prosperous
B．secretive
C．slack
D．shrill
单项选择题
Some linguists believe that the______age for children learning a foreign language is 5 to 8.
A．optimistic
B．optional
C．optimal
D．oppressed
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