2. 外语
  3. The mystery had now reached its climax: the man had undoubtedly been murdered, and it was absolutely certain no one could concei

The mystery had now reached its climax: the man had undoubtedly been murdered, and it was absolutely certain no one could concei

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问题    The mystery had now reached its climax: the man had undoubtedly been murdered, and it was absolutely certain no one could conceivably have done it. It was therefore time to call in the great detective, who gave one searching glance at the corpse, then produced a microscope.
   "Aha!" he exclaimed as he picked a hair off the lapel of the dead man’ s coat." The mystery is a mystery no longer. We have only to find the man who lost this hair, and the criminal will be in our hand." The inexorable chain of logic was complete, and the detective embarked on his search.
   For four days and four nights he moved unobserved through the streets of New York, scanning closely every face he passed, looking for a man who had lost a hair. On the fifth day he discovered a man disguised as a tourist, his head enveloped in a cap reaching below his ears. The man was about to board the Gloritania, and the detective lost no time in following him on board.
   "Arrest him!" shouted the detective, and then, drawing himself to his full height, he brandished aloft the hair." This is his," said the great detective," and it proves his guilt".
   "Remove his hat," ordered the ship’ s captain sternly.
   It was discovered that the man was entirely bald.
   "Aha!" exclaimed the great detective without a moment’ s hesitation." He has committed not one murder, but about one million !"
The theme of this story is that______.
选项 A、those using logic are not always logical
B、mysteries can always be solved by using logic
C、detectives can never be trusted
D、guilt can always be proved scientifically
答案A
解析 主旨题。从文章开始神秘命案使人束手无策到大侦探的介入，使案情出现转机的是他捡到了一根头发，按逻辑，以此为线索就应该找到凶手，因此，他把注意的焦点放在人们的头发上。当他看见一个游客把头包在帽子里，又把帽子拉得很低，盖住耳朵时，逻辑告诉他此人在试图掩盖他丢失一根头发这一事实，因此他贸然断定此人乃杀人凶手。当此人脱帽露出秃头时，逻辑继续引导他作出荒谬的推论；丢一根头发，犯一个命案：满头该有发丝百万根，而此人满头的头发都没有了，说明他谋杀了一百万人。可见，逻辑的出发点是正确的，却推出了错误的结论。B项有悖文中的事
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