单项选择题

A．The man is planning a trip to Austin.
B．The man has not been to Austin before.
C．The man doesn’’t like Austin.
D．The man has been to Austin before.
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单项选择题
A．They haven’’t devoted as much energy to medicine as to space travel.B．There are too many kinds of cold viruses for them to identify.C．It is not economical to find a cure for each type of cold.D．They believe people can recover without treatment.
A．They haven’’t devoted as much energy to medicine as to space travel.
B．There are too many kinds of cold viruses for them to identify.
C．It is not economical to find a cure for each type of cold.
D．They believe people can recover without treatment.
填空题
engagement
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