单项选择题

A．A vacation trip to Yellowstone 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
A．Relaxing at the seashore.B．Visiting her parents.C．Sailing on a boat.D．Preparing for a race.
A．Relaxing at the seashore.
B．Visiting her parents.
C．Sailing on a boat.
D．Preparing for a race.
填空题
If your company shares the same office building with some very large businesses, make sure______.
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