单项选择题

How does Professor Hall feel about visitors at his lectures

A．They make him feel good.
B．They make no impact on him.
C．They bore him.
D．They make him angry.
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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 net get rotten easily.
D．People had effective ways to preserve their food.
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