阅读理解-练习十一.doc

阅读理解 - 练习十（ 总分： 40.00 ，做题时间： 90 分钟 ）一、 Test 1 （ 总题数： 0，分数： 0.00）二、 TEXT A（ 总题数： 1，分数： 6.00）The word "laser" was coined as an acronym for Light Amplification by the Stimulated Emission of Radiation. Ordinary light, from the Sun or a light bulb, is emitted spontaneously, when atoms or molecules get rid of excess energy by themselves, without any outside intervention. Stimulated emission is different because it occurs when an atom or molecule holding onto excess energy has been stimulated to emit it as light.Albert Einstein was the first to suggest the existence of stimulated emission in a paper published in 1917. However, for many years, physicists thought that atoms and molecules always were much more likely to emit light spontaneously and that stimulated emission thus always would be much weaker. It was not until after the Second World War that physicists began trying to make stimulated emission dominate. They sought ways by which one atom or molecule could stimulate many others to emit light, amplifying it to much higher powers.The first to succeed was Charles H. Townes, then at Columbia University in New York. Instead of working with light, however, he worked with microwaves, which have a much longer wavelength, and built a device he called a "maser", for Microwave Amplification by the Stimulated Emission of Radiation. Although he thought of the key idea in 1951, the first maser was not completed until a couple of years later. Before long, many other physicists were building masers and trying to discover how to produce stimulated mission at even shorter wavelengths.The key concepts emerged about 1957. Townes and Arthur Schawlow, then at Bell Telephone Laboratories, wrote a long paper outlining the conditions needed to amplify stimulated emission of visible light waves. At about the same time, similar ideas crystallized in the mind of Gordon Gould, then a 37-year-old graduate student at Columbia, who wrote them downin a series of notebooks. Townes and Schawlow published their ideas in a scientific journal, Physical Review Letters, but Gould filed a patent application. Some decades later, people still argue about who deserves the credit for the concept of the laser.（分数： 6.00 ）（1）.Which of the following statements best describes a laser? （分数： 1.00 ）A. A device for stimulating atoms and molecules to emit light. VB. An atom in a high2energy state.C. A technique for destroying atoms or molecules.D. An instrument for measuring light waves.解析：（2） .Why was Townes' early work with stimulated emission done with microwaves? （分数： 1.00 ）A. He was not concerned with light amplification.B. It was easier to work with longer wavelengths. VC. His partner Schawlow had already begun working on the laser.D. The laser had already been develope解析：（3） .In his research at Columbia University, Charles Townes worked with all of the following EXCEPT . （分数： 1.00 ）A. stimulated emissionB. microwavesC. light amplification VD. a maser解析：（4） .In approximately what year was the first maser built? （分数： 1.00 ）A. 1917.B. 1951.C. 1953. VD. 1957.解析：（5） .Why do people still argue about who deserves the credit for the concept of the laser? （分数：1.00 ）A. The researchers' notebooks were lost.B. Several people were developing the idea at the same time. VC. No one claimed credit for the development until recently.D. The work is still incomplet解析：（6） .According to the passage, Townes, Arthur Schawlow and Gordon Gould didn't . （分数：1.00 ）A. come up with similar ideas about laserB. write their ideas downC. work at Columbia University VD. share their ideas for the study of the laser解析：三、 TEXT B（ 总题数： 1，分数： 4.00）Anna Douglas was 72 years old when she started writing her newspaper column. She had been thedirector of a school and a camp before she retired, but she needed to keep busy, and she was evenwilling to work without pay. That was the reason why she found a volunteer job with an agency.The agency that she chose to work for was a business that helped other businesses finds jobs for old people. Every day she talked with other retired people like herself. By talking, she recognized two things: old people had abilities that were not being used; old people also had problems-mostlyproblems with communication.Anna Douglas found a new purpose for herself. Through the years, from time to time she had written stories about people for national magazines. Nowthere was a new subject: old people like herself. She began to write a newspaper column called "Sixty Plus" which focused on getting old. She writes about the problems of old people, especially their problems with being misunderstood.Anna Douglas uses her thinking ability to see the truth behind a problem. She understands the reasons why problems begin. She understands old people and young people, too. For example, one of her readers said that his grandchildren left the house as soon as he came to vis。