单项选择题

A．During registration.
B．On the first day of class.
C．At mid-semester.
D．During the final week.
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单项选择题
A．Not to worry about her umbrella.B．Clean up her room.C．Get her umbrella back before noon.D．Not to wait for him after lunch time.
A．Not to worry about her umbrella.
B．Clean up her room.
C．Get her umbrella back before noon.
D．Not to wait for him after lunch time.
单项选择题
A．A student and a professor.B．A physicist and a biologist.C．Two students.D．Two professors.
A．A student and a professor.
B．A physicist and a biologist.
C．Two students.
D．Two professors.
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