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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单项选择题

Why does the author say that nothing was wasted before the invention of fridges（）

A．People would not buy more food than was necessary.
B．Food was delivered to people two or three times a week.
C．Food was sold fresh and did not get rotten easily.
D．People had effective ways to preserve their food.

单项选择题

What is the author' s overall attitude toward fridges（）

A．Neutral.
B．Critical.
C．Objective.
D．Compromising.