单项选择题

A．Calling on her parents.
B．Teaching.
C．Business and pleasure.
D．Going back home.
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单项选择题
The word prevalent (Sentence 1, Para. 1)in this passage means
A．current
B．famous
C．notorious
D．acceptable
单项选择题
George Spilich's experiment was conducted in such a way as to ______.
A．compel the subjects to separate major information from minor details
B．put the subjects through increasingly complex tests
C．cheek the effectiveness of nicotine on smokers
D．register the prompt responses of the subjects
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