Tom was a college student. He often made excuses not to attend classes. Also, he spent much of his free time playing computer games. He never went to the library to study.

      How time flew! At the end of the term, there was one important event that he was afraid of – the final exam. "What should I do?" Tom walked up and down in the room the day before the exam. He was keyed up. Suddenly, he thought of an idea.

     The next morning, Tom went into the exam room very early. He found a young man who looked so confident and took a seat next to him. "Hey your" Tom greeted. "What?" The young man asked.

    "Can you do me a favor?" Tom begged(恳求), "Please let me copy your paper(试卷)during the exam. I have to depend on you!" When hearing his words, the young man just smiled but said nothing.

    When the bell rang, the young man stood up immediately and came to the front, saying,  "Now I will hand out(分发)the papers to all of you and collect them in one hour." Tom sat there with his mouth wide open.

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 Last year, a special kind of glove came out. It was invented to help bind people to learn Braille,which is a special system for the blind to read by touching. Shaking motors (震动马达) are put on each finger of the glove. They can make different sounds to tell a user which letter he is touching.Recently, two British college students have invented another special glove for the blind. It can make the user feel small and quick movements. An ultrasonic sensor(超声波传感器)with a battery is put on the back of the glove. When the user wearing the glove is close to an object（物体）, ultrasonic waves( 超声波)from the glove are sent out  (发出). As soon as they hit the object in front,  the waves will return to the glove. Then the waves cause the glove to shake. And the ultrasonic sensor makes different kinds of sounds. The sounds make the user know how far he is from the object.

  In the college invention competition, the two students got first prize and won 1,540 pounds. One of the designers said, "Now the ultrasonic sensor on the glove is quite large. We're going to use the money to develop a smaller and lighter ultrasonic sensor.

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