单项选择题

Machines that use hydraulic pressure including elevators, dentist chairs, and automobile brakes（）.

A．exclude
B．excluding
C．include
D．are included

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单项选择题

Unlike competitive running , race walkers must always keep some portion of their feet in contact with the ground（）.

A．run
B．runner
C．runners
D．running race

单项选择题

Furniture makers use glue to hold joints together and sometimes to reinforce it（） .

A．its
B．fast
C．hard
D．them

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