单项选择题

A candle is used to burn at auction sales______.

A．because they took place at night
B．as a signal for the crowd to gather
C．to keep the auctioneer warm
D．to limit the time when offers could be made
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单项选择题
The end of the bidding is called knocking down because______.
A．the person who offers the highest price wins
B．all the buyers win except one fail
C．the goods are knocked down on to the table
D．the auctioneer bangs the table with a hammer
单项选择题
Earth scientists have come to understand that climate______.
A．is going through a fundamental change
B．has been getting warmer for 10 000 years
C．will eventually change from hot to cold
D．has gone through periodical changes
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