单项选择题

In the eighties, Americans as a whole _________.

A．became richer
B．became poorer
C．lived a poorer life than in the seventies
D．needed more jobs to support their families
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单项选择题
A candle used to burn at auction sales _________.
A．because they took place at night
B．as a signal for the crowd to gather
C．to give light to the auctioneer
D．to limit the time when offers could be made
单项选择题
Auctioned goods are sold _________.
A．for the highest price offered
B．only at fixed prices
C．at a price less than their true value
D．cheaply
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