单项选择题

A．In the office.
B．In a factory.
C．At the airport.
D．At the railway station.
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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
Who benefited the least from fridges according to the author
A．Inventors.
B．Consumers.
C．Manufacturers.
D．Traveling salesmen.
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