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  3. The crowd stirred and whispered in awe as, on the stage, the horse slowly tapped out the beat. Everyone became tense and quiet a

The crowd stirred and whispered in awe as, on the stage, the horse slowly tapped out the beat. Everyone became tense and quiet a

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问题     The crowd stirred and whispered in awe as, on the stage, the horse slowly tapped out the beat. Everyone became tense and quiet as the number of taps neared the correct answer to the horse trainer’s question. After The final tap, the horse paused, seemed to look around and stopped. The crowd went wild !
    The horse’s name was Clever Hans, the Educated Horse, and was featured in a vaudeville(杂耍) act in the early 1900s, in Europe. When asked a complicated mathematical question by his owner, Clever Hans would tap out the correct answer with his hooves. For example, if the answer was sixty- eight, Hans would tap out six with his left hoof and eight with his right hoof. Even mere remarkable, the owner would leave the room after asking the question, so there could be no secret signal between owner and horse. A mere animal seemed to be accomplishing a highly technical skill of man’s !
    It wasn’t until years later that the secret of the trick was revealed. The owner had trained Clever Hans to respond to slight signals. The horse became so sensitive that he learned when to stop from the crowd’s reaction. Members of the audience would start involuntarily, or give some unconscious signal, when Hans reached the right answer. Modern scientists now warn against the Clever Hans syndrome (综合征), whereby researchers unconsciously give clues to their animal subjects about the actions they like to see performed!  
The Clever Hans syndrome is a danger to be avoided by ______.
选项 A、audience
B、researchers
C、veterinarians
D、mathematicians
答案B
解析 最后一段。发现了这匹马会做算术的秘密后，科学家感觉很担心，他们拿来做实验的动物也会在他们无意识的暗示下做出他们希望的行为。这样所做出的结论肯定不会准确，所以是应当被科学家避免的。选项B是正确的。
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