单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．A professor and a student.
B．A hotel manager and a tourist.
C．A salesman and a customer.
D．A store owner and his manager.
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单项选择题
According to the author, sex roles ______.
A．are socially determined
B．are emotionally and physically determined
C．can only be determined by what education people take
D．are biologically and psychologically determined
单项选择题
Road courtesy is good sense because ______.
A．it minimizes quarrels
B．it cuts down the number of drivers
C．most drivers will hit you if offended
D．most drivers never make acknowledgements
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