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
It can be inferred that poverty _________.
A．is defined very concretely in every period
B．is difficult to define in specific terms
C．is defined in material terms
D．is defined according to the standard of each decade
单项选择题
The end of the bidding is called knocking down because _________.
A．the auctioneer knocks the buyer clown
B．the auctioneer knocks the rostrum down
C．the goods are knocked down on to the table
D．the auctioneer bangs the table with a hammer
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