单项选择题

A．At an industrial site.
B．In a classroom.
C．At a department store.
D．In a laboratory.
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单项选择题
A．The foundation.B．The reliability.C．The history.D．The source.
A．The foundation.
B．The reliability.
C．The history.
D．The source.
单项选择题
A．He works hard.B．He likes the professor.C．He uses his good relationship to get favors.D．He is pleased with the professor’ s teaching.
A．He works hard.
B．He likes the professor.
C．He uses his good relationship to get favors.
D．He is pleased with the professor’ s teaching.
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