单项选择题

Business in this area has been______because prices are too high.

A．prosperous
B．secretive
C．slack
D．shrill
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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
单项选择题
The purchaser of this lorry is protected by the manufacturer's warranty that he will re- place any defective part for five years or 50,000 miles.
A．prohibition
B．insurance
C．prophecy
D．guarantee
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