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
What the critics said in the first paragraph amounts to the idea that ______.
A．no admission policies based on race should be implemented.
B．minority applicants should be given favorable considerations.
C．different standards for admitting minority students should be set up.
D．selective colleges and universities should be punished for their discriminatory policies.
单项选择题
A candle 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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