单项选择题

A．1016.
B．1060.
C．508.
D．580.
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单项选择题
Who benefited the least from fridges according to the author
A．Inventors.
B．Consumers.
C．Manufacturers.
D．Traveling salesmen.
单项选择题
Which of the following phrases in the fifth paragraph indicates the fridge’’s negative effect on the environment
A．Hum away continuously.
B．Climatically almost unnecessary.
C．Artificially-cooled space.
D．With mild temperatures.
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