单项选择题

The earliest form of artificial lighting was fire, which also provided warm and protection（）.

A．hot
B．sunshine
C．warmth
D．safe

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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

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

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