单项选择题

A．The weakness of the price system.
B．The complexities of the price system.
C．Credit terms in transactions.
D．Resource allocation and the public service
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单项选择题
A．She went shopping.B．She did some sewing.C．She repaired her car.D．She bought some tobacco.
A．She went shopping.
B．She did some sewing.
C．She repaired her car.
D．She bought some tobacco.
单项选择题
A species of plants or animals includes all such individuals that are similar to each other and have proceeded from one common parentage.
A．Y
B．N
C．NG
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