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A．They make him feel good.B．They make no impact on him.……

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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填空题reporters journalists audience

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.

单项选择题Why it is difficult to say exactly how many miles of improved waterways are in operation

A．The most recent figure is for 1975 and the figure is declining.
B．Water transport’s market share goes up and down frequently.
C．So few miles of inland waterways exist that no one has bothered to count them.
D．You must know whether to include coastwise and inter-coastal shipping in the figure.

单项选择题The main difference between natural and artificial selection is that human beings______.

A．control the direction of artificial selection
B．control the direction of natural selection
C．make new genes in artificial selection
D．make new genes in natural selection

单项选择题Which of the following would be the best title for this selection

A．Teaching Your Child to Succeed.
B．Learning from Failure.
C．How to Be Successful
D．Why We Are So Afraid of Failure.