单项选择题

The passage is mainly concerned with______.

A．how an auction is conducted
B．the auctioneer's role in an auction
C．the development of auctioning
D．the kinds of goods to be auctioned
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单项选择题
At an auction, a bidder may get an item at a low price if he______.
A．beats others in the bidding
B．promises to sell the item again later
C．can fix a "reserve" price
D．reaches some agreement beforehand with other prospective buyers
单项选择题
One difficulty in discovering kwashiorkor is that______.
A．it has no viruses
B．it is like other diseases
C．it is hard to see signs of it
D．it does not last long
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