单项选择题

The author's knowledge of Tibet is probably ______.

A．based on firsthand experience
B．the result of lifelong studies
C．derived from books only
D．limited to geological history
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单项选择题
An auction catalogue gives prospective buyers ______.
A．the current market values of the goods
B．details of the goods to be sold
C．the order in which goods must be sold
D．free admission to the auction sale
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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