单项选择题

This diploma is important, which（）that you have completed high school.

A．amplifies
B．certifies
C．clarifies
D．magnifies

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单项选择题

A group of scholars from several countries were holding a（）on new trend of literature.

A．fort
B．foam
C．forum
D．summit

下列（）装置属于电梯的安全保护装置。

A.曳引轮
B.限速器
C.门锁
D.缓冲器