单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．Giving a lecture.
B．Discussing physics problems.
C．Waiting for a friend.
D．Reading twentieth-century literature.

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单项选择题

A．It doesn’t matter which apartment the man chooses.B．It’s a difficult decision.C．She doesn’t like either apartment.D．The man should choose a different apartment.

A．It doesn’t matter which apartment the man chooses.
B．It’s a difficult decision.
C．She doesn’t like either apartment.
D．The man should choose a different apartment.

填空题

This week’s Nobel Prize winners in medicine proved that most ulcers were caused by a lowly bacterium,

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