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
Boston University is like a self-contained island within a city.
A．Y
B．N
C．NG
单项选择题
A．Four contestants failed to win prizes.B．The man participates in the quiz show.C．The woman missed the show.D．Five contestants won cell phones.
A．Four contestants failed to win prizes.
B．The man participates in the quiz show.
C．The woman missed the show.
D．Five contestants won cell phones.
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