单项选择题

An auctioneer likes to get high prices for the goods he sells because ______.

A．then he earns more himself
B．the dealers are pleased
C．the anction-rooms become world famous
D．it keeps the customers interested
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单项选择题
The auctioneer may decide to sell the lots out of order because ______.
A．he sometimes wants to confuse the buyers
B．he knows from experience that certain people will want to buy certain items
C．he wants to keep certain people waiting
D．he wants to reduce the number of buyers
单项选择题
According to the brain blood flow studies, problem solving ______.
A．increases blood flow in some areas of the brain
B．causes changes in the distribution of blood in the brain
C．demands intense concentration of blood in certain areas
D．is based on the ability to recite the time
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