2022年考研外语考试真题及答案45.docx
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1、2022年考研外语考试真题及答案一、Part I: Vocabulary (20 minutes, 10 points, 0. 5 point each)1 、 Psychological studies show that some people are quick-tempered.A. at heartB.on purposeC. in personD.by nature2、 If a person talks about his weak points, his listener is expected to say something in the way of .A. assure
2、sB.encouragementC.persuasionD.confirmation3、 He washigh school and college instructors tryingto teach him how to think to use the scientific method rather than teaching him the structure of the subject.A.put up withB.given way toC. fallen back on9、A. dealB. numberC. mountD. amount10、A.combinationsB.
3、connectionsC.co-ordinationsD.collections四、Part III Reading Comprehensionin this part there are four passages followed by questions or unfinished statements, each with four suggested answers. Choose the one you think is the best answer and mark your choice on the Answer Sheet.1、 The need for solar el
4、ectricity is clear. It is safe, ecologically sound, efficient, continuously available, and it has no moving parts. The basic problem with the use of solar photovoltaic devices is economics, but until recently very little progress had been made toward the development of low-cost photovoltaic devices.
5、 The larger part of research funding has been devoted to study of single-crystal silicon solar cells, despite the evidence, including that of thetechnique holds little promise. The reason for this pattern is understandable and historical. Crystalline silicon is the active element in the very success
6、ful semiconductor industry, and virtually all of the solid state devices contain silicon transistors and diodes. Crystalline silicon, however, is particularly unsuitable to terrestrial solar cells. Crystalline silicon solar cells work well and are successfully used in the space program, where cost i
7、s not an issue. While single-crystal silicon has been proven in extraterrestrial use with efficiencies as high as 18 percent, and other more expensive and scare materials such as gallium arsenide can have even higher efficiencies, costs must be reduced by a factor of more than 100 to make them pract
8、ical for commercial use. Besides the fact that the starting crystalline silicon is expensive, 95 percent of it is wasted and does not appear in the final device. Recently, there have been some imaginative attempts to make polycrystalline and ribbon silicon, which are lower in cost than high-quality
9、single crystals; but to date the efficiencies of these apparently lower-cost arrays have been unacceptably small. Moreover, these materials are cheaper only because of the introductionof disordering in crystalline semiconductors, and disorder degrades the efficiency of crystalline solar cells.This d
10、ilemma can be avoided by preparing completely disordered or amorphous materials. Amorphous materials have disordered atomic structure as compared to crystalline materials: that is, they have only short-range order rather than the long-range periodicity of crystals. The advantages of amorphous solar
11、cells are impressive. Whereas crystals can be grown as wafers about four inches in diameter, amorphous materials can be grown over large areas in a single process. Whereas crystalline silicon must be made 200 microns thick to absorb a sufficient amount of sunlight for efficient energy conversion, on
12、ly 1 micron of the proper amorphous materials is necessary. Crystalline silicon solar cells cost in excess of $100 per square foot, but amorphous films can be created at a cost of about 50 per square foot. Although many scientists were aware of the very low cost of amorphous solar cells, they felt t
13、hat they could never be manufactured with the efficiencies necessary to contribute significantly to the demand for electric power. This was based on a misconception about the feature which determines efficiency. For example, it is not the conductivity of the materials in the dark which is relevant,b
14、ut only the photoconductivity, that is, the conductivity in the presence of sunlight. Already, solar cells with efficiencies well above 6 percent have been developed using amorphous materials, and further research will doubtless find even less costly amorphous materials with higher efficiencies. Wha
15、ts the major obstacle to the wide use of solar electricity?A. Solar photovoltaic devices are too expensive.B.Little research has been done to study solar cells.C. Solar electricity is neither safe nor efficient.D. The leading manufacturers only produce crystalline silicon for extraterrestrial use.2、
16、 According to the passage, which of the following is NOT true of crystalline silicon?A.It can be found in nearly all solid state devices in the form of transistors and diodes.B. It is successfully used in the space program with high efficiency.C. It is unsuitable to terrestrial solar cells as it is
17、limited to military use.D. Its use is not economical with a high percentage wasted.3、 The authors attitude toward attempts to make polycrystalline and ribbon silicon can best be described asA. enthusiasmB. optimismC. doubtD.Disapproval4、 In Para. 3, the author focuses primarily on.A.presenting two t
18、ypes of materials for solar cellsB.discussing the advantages of amorphous materials over crystalline siliconC. pointing out the feasibility of using amorphous materials in extraterrestrial programsD. outlining the specific reasons why a problem in solar cells has not yet been solved5、 Which of the f
19、ollowing was true of many scientists?A. They felt amorphous materials were too costly.B.They were doubtful whether they could develop amorphous solar cells with higher efficiencies.C. They realized that it was the conductivity in the presence of sunlight that was relevant to efficiency.D.They were o
20、ptimistic about the future use of amorphous materials with higher efficiencies.五、Passage Two1、My hands are sweating, my face is breaking out, my heartis pounding, my temper is short. Am I having a heart attack? Am I having a nervous breakdown? No! Final exams are coming up and I am experiencing test
21、 anxiety. Is test anxiety destructive? Can we make test anxiety work for us? The answer to both of these questions is yes. Test anxiety often interferes with student performance but this same test anxiety, if channeled correctly, can help improve performance. The good side of test anxiety is that it
22、 causes us to attend to the problem. It motivates us to want to study and prepare for the exam. Without this catalyst we might never be concerned about preparing for a test. Thus, a little anxiousness shouldnt worry you. Those of us who speak publicly know that a few butterflies in the stomach just
23、prior to a speech means that we will probably do a good job, that we will focus on our speech and block out extraneous material. However, when stress interferes with your ability to concentrate, then it has reached the destructive state. In order to lessen the destructive elements of test anxiety, t
24、he approach should be to develop improved confidence and knowledge. These two factors go hand in hand. As your knowledge of the course material increases, your confidence in your ability to succeed will increase. As your confidence increases, youranxiety will go down, allowing your knowledge to come
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