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 continuously"
B．"Climatically almost unnecessary"
C．"Artificially-cooled space"
D．"With mild temperatures"
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单项选择题
It is surprising that Americans who worship variety and individuality______.
A．still judge a man by his clothes
B．hold the uniform in such high regard
C．enjoy having a professional identity
D．will respect an elevator operator as much as a general in uniform
单项选择题
According to the passage diversity can be achieved in American society by______.
A．expanding the pool of potential employees
B．promoting policies that provide skills to employees
C．training more engineers, scientists lawyers and business managers
D．providing education for all regardless of race or sex
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