单项选择题

Questions 23 to 25 are based on the conversation you have just heard.

A．Her professor.
B．A classmate.
C．Her former boss.
D．A foreign diplomat.
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单项选择题
Americans enjoy fast food mainly because ______ .
A．it can be eaten in the car
B．it is much more tasty than home-made food
C．one only uses his fingers while eating it
D．it is time-saying and convenient
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