C．Mark Twain went to the woods in Maine for writing

　　stories.

　　D．The stranger was the one who caught people fishing in

　　winter.

　　B

　　Have you ever had the strange feeling that you were being watched？You turned around and，sure enough，someone was looking right at you!

　　Some psychologists(心理学家)say that humans have a natural ability to sense when someone is looking at them.To study whether such a“sixth sense”really exists，Robert Baker，a psychologist at the University of Kentucky，performed two experiments.

　　In the first one，Baker sat behind unknowing people in public places and stared at the backs of their heads for 5 to 15 minutes.The subjects were eating，drinking，reading，studying，watching TV，or working at a computer.Baker made sure that the people could not tell that he was sitting behind them during those periods.Later，when he questioned the subjects，almost all of them said they had no sense that someone was staring at them.

　　For the second experiment，Baker told the subjects that they would be stared at from time to time from behind a twoway mirror in a lab setting.The people had to write down when they felt they were being stared at and when they weren’t.Baker found that the subjects were no better at telling when they were stared at than if they had just guessed.

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