单项选择题


Questions 21-23 are based on the talk you’ve just heard.
Who are talking in this dialogue

A．A student and a professor.
B．A physicist and a biologist.
C．Two students.
D．Two professors.
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单项选择题
This passage is concerned mostly with ______.
A．the free enterprise system in America
B．the difficulty of living on a fixed income
C．innovative techniques in food processing
D．the advances of advertising techniques
单项选择题
Where do you think this dialogue takes place
A．At the station.
B．At the coach station.
C．At the travel agency.
D．At a library
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