单项选择题

A professor of economic and history at Atlanta University, W.E.B. Du Bois, promoted full racial equality（）.

A．economy
B．economics
C．economical
D．economic

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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
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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