单项选择题

The word carbon (Para. 2, Line 3) stands for" ______".

A．intelligent robots
B．a chemical element
C．an organic substance
D．human beings
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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".
单项选择题
What is the author's overall attitude toward fridges
A．Neutral.
B．Critical.
C．Objective.
D．Compromising.
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