单项选择题

It all started in 1950, when people began to build their houses on the______of their cities.

A．paradises
B．omissions
C．orchards
D．outskirts
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单项选择题
It was clear that the storm______his arrival by two hours.
A．retarded
B．retired
C．refrained
D．retreated
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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