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．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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