单项选择题

From context clues, we can guess that the word "centenary" (Para.4,line 3) means

A．celebration.
B．one hundred years.
C．a noteworthy year.
D．an annual celebration.
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单项选择题
Who benefited the least from fridges according to the author
A．Inventors.
B．Consumers.
C．Manufacturers.
D．Travelling salesmen.
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.
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