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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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 foo
单项选择题
Cancellation of the flight______ many passengers to spend the night at the airport.
A．resulted
B．obliged
C．demanded
D．recommended
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