单选题
Very often, the human eye and brain can recognize familiar shapes even if all but a few significant points are left out. It is this creative power of the human eye and brain that may someday allow profoundly deaf people to talk in sign language over a special "telephone". Researchers have found that thirteen spots of light on each hand and one spot on the nose--to show head motion and provide a reference point for hand position--are sufficient for the performing of American Sign Language. The bright spots are produced by attaching pieces of a special tape to the nose, fingertips, and wrists and adjusting a closed-circuit television system so that only the bright spots appear on the screen of the receiver. After a few minutes of familiarization, pairs of deaf people are able to communicate freely over television. Deaf people and other sign readers can, of course, understand sign language on commercial television. But widespread link-ups of television systems for personal communication are economically impolite because a standard picture requires about one thousand times more information than a telephone circuit can carry. The researchers think if likely through the simplified picture of twenty-seven moving dots used in their experiments can be reduced to the capacity of a telephone line.
单选题
According to die passage, the person viewing tile closed-circuit screen sees ______. A. two hands and a face B. bright dots C. a person using sign language D. a written message
单选题
What causes the bright spots appearing on the screen of the receiver? A. Movable points. B. A special tape. C. Small mirrors. D. Small lights.
【正确答案】
B
【答案解析】细节题。使亮光点显现在电视机屏幕上的方法有两种：①第一题中谈到的adjusting a closed-circuit television system；②给鼻子、手指和手腕附上几条special tape(见文章第四句)。据此，选项B正确。其他三项均错。
单选题
It would take a person who knows sign language ______ to be accustomed to using the new device. A. less than an hour B. a day C. more than an hour D. a week
【正确答案】
A
【答案解析】细节题。文章第五句讲，“After a few minutes of familiarization…”。由此得知，适应这种新装置的时间实际上只有几分钟，也就不到一小时。选项A正确。
单选题
How many spots of light will be used in the new communication system? A. 26. B. 13. C. 14. D. 27.
【正确答案】
D
【答案解析】细节题，文章第三句讲，每只手需13束光，外加一束打在鼻子的光，总共27束。选项D正确。
单选题
Which of the following would be the best title for the passage? A. A New Application of Commercial Television. B. A Telephone for Deaf People. C. Capabilities of the Human Eye and Brain. D. American Sign Language.