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  3. A young girl and a man were recently found murdered in a parked car in a Boston suburb. The police found no clue (线索) in the car

A young girl and a man were recently found murdered in a parked car in a Boston suburb. The police found no clue (线索) in the car

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问题     A young girl and a man were recently found murdered in a parked car in a Boston suburb. The police found no clue (线索) in the car. Then they found a witness who had seen a car pass by the murdered couple’s car. He said it was a 1950 or 1951 Chevrolet (雪佛莱牌汽车).
    Ordinarily, searching through the files for owners of elderly Chevies would have been an impossibly difficult task because there were two and a half million such cars. In this case, however, the police had a powerful tool--the computer.
    The Boston Registry of Motor Vehicles programmed its computer to screen all 1950 and 1951 Chevrolets within a fifteen-mile radius (半径) of the suburb--the area in which the police believed the murderer was most likely to be found. Within minutes, the computer uncovered one thousand of the wanted cars. A few hours of careful hand screening turned up a 1950 Chevrolet owner who lived close to the scene of the crime and who had received many traffic tickets (交通罚款). He was among the first suspects to be investigated, and evidence linking him to the murdered couple was found. He was arrested, and is now waiting for trial (审判).
The murderer was at last found ______.
选项 A、with the help of a Chevrolet owner
B、with the help of computers
C、by a witness
D、in a car
答案B
解析 本题为推理题。文章告诉我们，警方最初只发现一男一女在车内被谋杀，唯一的线索只是一个目击者，证明曾见过一辆1950或1951型号的雪佛莱汽车从死者车旁经过。但如果没有计算机的帮助，要从250万辆这种型号的车辆中找出凶手的车是不可能的。所以，计算机的帮助成了抓获凶手的关键，证人仅提供了线索，但并未亲自去抓捕罪犯，所以B正确，而C错误。A和 D与文中内容相矛盾。
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