单项选择题

What kind of goods can not be sold in auctions

A．Those produced in the same factories.
B．Those provided by the same sellers.
C．Those which have the same qualities.
D．Those which have only one bidder.

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单项选择题

As pointed out at the beginning of the passage, people used to think that air pollution _____.

A．caused widespread damage in the countryside
B．affected the entire eastern half of the United States
C．had damaging effects on health
D．existed merely in urban and industrial areas

单项选择题

At what prices are auctioned goods usually sold

A．The highest prices offered by the buyers.
B．The fixed prices advertised beforehand.
C．The prices higher than their true value.
D．The prices demanded by the seller.