单项选择题

A．To the library
B．To the theatre
C．To the research institute
D．To the laboratory
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单项选择题
A．Physics.B．Mathematics.C．Environmental science.D．Life science.
A．Physics.
B．Mathematics.
C．Environmental science.
D．Life science.
单项选择题
A．A traffic guard.B．A sociologist.C．A student.D．A librarian.
A．A traffic guard.
B．A sociologist.
C．A student.
D．A librarian.
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