单项选择题

Please contact Jen Davis in the HR Department if you have any questions regarding the new overtime and vacation______.（）

A．methods
B．policies
C．reactions
D．behaviors

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单项选择题

A．cause
B．study
C．practice
D．manufacture

单项选择题

Johnson’s paper ______three processes for generating hydrogen in fuel cells.（）

A．compares
B．comparisons
C．is compared
D．was a comparison

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