题目内容
Passage Five
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).
51. The computer DIDN'T help the police ______.
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Passage Four
One evening Mr. Green was driving home along a lonely country road. He had ￡ 100.00 in his pock et. At the loneliest part of the road, a man asked for a lift (搭车). Mr. Green told him to get into the car and continued his driving. When he talked to the man and learned that the man had been in prison for robbery and had broken out of prison two days before, Mr. Green was very worried.
Suddenly he saw a police-car and had a bright idea. He just reached a small town where the speed limit (限制速度) was 30 miles an hour. But he drove the car as fast as it could go. He looked back and saw that the police-car had begun to chase (追) him. After a mile or so the police-car overtook (赶上) him and ordered him to stop. A policeman got out and came to Mr. Green's car. Mr. Green hoped that he could tell the policeman about the escaped robber, but he felt the man had put a gun against his back. The policeman took out his notebook and pencil, saying he wanted Mr. Green's name and address. Mr. Green asked to be taken to the police station, but the policeman said, "No, you will have to appear at the police station later." Mr. Green had to do as the policeman told him. The policeman wrote his name and address down, put his notebook and pencil back in his pocket and gave Mr. Green a talk about dangerous driving. Then Mr. Green started up his car again and drove on.
Just as he reached the outskirts (郊区) of London, the passenger said, "! want to get off here." Mr. Green stopped the car, the man got out and said, "Thanks for the lift. You've been good to me. This is the least I can do in return (报答)." And he handed Mr. Green the policeman's notebook, which he stole while the policeman was talking to Mr. Green.
46. The man asking for a lift was ______.
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把镁铝合金放入盐酸中全部溶解后，再加过量的NaOH溶液，溶液中的沉淀物是__________。
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