单项选择题

Who benefited the least from fridges according to the author

A．Inventors.
B．Consumers.
C．Manufacturers.
D．Travelling salesmen.
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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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