题目

读“北半球某海平面等压线分布图”，完成下列问题。 （1）甲线附近形成了____________________锋，乙线附近形成了____________________锋。 （2）图中A、B、C、D四地处于雨区的有____________________。   答案：（1）冷 暖 （2）A、D  第（1）题，图中甲、乙两条线是低气压中等压线最大凸向点的连线，所以为槽线，其两侧风向明显不同。B、C所在地区风向为来自南方的偏南风，所以为性质暖湿的暖气团；而A、D两地气流则为北方的冷气团。据此我们可以判断出，甲、乙两条线附近实际上形成了两个锋面，又据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 impossible because a standard picture requires about one thousand times more information than a telephone circuit can carry. The researchers think it likely that the simplified picture of twenty-seven moving dots used in their experiments can be reduced to the capacity of a telephone line. 　　  1. According to the passage, the person viewing the closed-circuit screen sees 　　　　   A. two hands and a face　　　　　　　　　　　　 B. bright dots 　　　　   C. a person using sign language　　　　　　　　   D. a written message 　　  2. 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. 　　  3. How many spots of light will be used in the new communication system? 　　　　   A. 26.　　　　  B. 13.　　　　    C. 14.　　　　　　　　 D. 27. 　　  4. Which of the following would be the best tide 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