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

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