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
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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.
单项选择题
Why does the auctioneer decide to sell the lots out of their numerical order.'
A．He wants to confuse some dealers and make them bid the highest price.
B．He can hold back certain goods until the interested dealers arrive.
C．He wants to keep certain people waiting in order to reduce the number of buyers.
D．He is sometimes bribed by certain dealers who want to buy certain articles cheap.
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