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某司机驾车前行,突然发现前方70m处有障碍物.平时司机从发现险情到刹车制动需要的反应时间为0.7s,这段时间内汽车保持原速前行了14m.汽车制动后还要继续向前滑行20m才能停下.
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    Mrs. Brown was tired after her day's shopping in London, so she went into a restaurant for a cup of tea 1 catching the train home. When she had ordered her tea, she suddenly remembered that she had to buy some 2 for her husband, who had a cough.

    “Is there a chemist's near here?” she asked the waiter. “Yes, madam.” the waiter said. “It's only about three minutes' walk away. Turn right when you go out of the restaurant, then take the second turning to the left. You'll find a big chemist's about a hundred yards up the road on the right-hand side. It closes at five, but if you 3, you'll just get there in time.”

    Mrs. Brown followed the waiter's directions 4 and found the chemist's shop without any difficulty. She bought the cough mixture and started to 5 her way back to the restaurant. But after she had walked for about ten minutes and there was still no 6 of the restaurant, she realized that she must have made a mistake.

    “Oh! I am 7!” said Mrs. Brown. “I've left all my shopping in the restaurant and now I'm lost.”

    She was still wondering what to do when a policeman came 8 and asked if he could help. Mrs. Brown 9 what had happened.

    “Well, first of all,” said the policeman, “we had better go back as far as the chemist's”. “Now,” suggested the policeman, when they got to the chemist's, “let's go in this direction. It leads to the main road, where we shall probably find your restaurant.” When they reached the main road, the policeman said, “I think you'll find the restaurant you are looking for along there, on the opposite side of the road.” Mrs. Brown thanked the policeman for his help. “I can't 10 how I went wrong,” she said. The policeman smiled. “It's quite easy,” he said, “to get lost in a big city like London.”