单项选择题

Questions 14～17 are based on the following dialogue. What did the professor want to talk Ann about

A．A vacation trip to Yellow Stone Park.
B．A lecture by a visiting professor.
C．Her biology thesis.
D．A research project.
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单项选择题
How long did it take for a letter to get to the USA six years ago
A．Usually four or five days.
B．A week.
C．More than a week.
D．It depends.
单项选择题
As the conversation begins, what are the man and woman doing
A．Looking at some photographs.
B．Selling cameras.
C．Teaching a photography class,
D．Repairing camera equipment,
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