卫生类职称英语考试报名,2017职称英语考试卫生类C级备考辅导六

　2017年职称英语考试卫生类C级备考辅导六

　　LED Lighting

　　1 An accidental discovery announced recently has taken LED lighting to a new level, suggesting it could soon offer a cheaper, longer-lasting alternative to the traditional light bulb. The breakthrough adds to a growing trend that is likely to eventually make Thomas Edison’s bright invention1 obsolete. LEDs are already used in traffic lights, flashlights, and architectural lighting. They are flexible and operate less expensively than traditional lighting.

　　2 Michael Bowers, a graduate student2 at Vanderbilt University, was just trying to make really small quantum dots, which are crystals generally only a few nanometers big. Quantum dots contain anywhere from 100 to 1,000 electrons3. They’re easily excited bundles of energy, and the smaller they are, the more excited they get. Each dot in Bower’s particular batch was exceptionally small, containing only 33 or 34 pairs of atoms.

　　3 When you shine a light on quantum dots or apply electricity to them, they react by producing their own light, normally a bright, vibrant color. But when Bowers shined a laser on his batch of dots, something unexpected happened. He was surprised when a white glow covered the table. The quantum dots were supposed to emit blue light4, but instead they were giving off a beautiful white glow.

　　4 Then Bowers and another student got the idea to stir the dots into polyurethane and coat a blue LED light bulb with the mix. The lumpy bulb wasn’t pretty, but it produced white light similar to a regular light bulb. 5 LEDs produce twice as much light as a regular 60 watt bulb and burn for over 50.000 hours. The Department

　　of Energy estimates LED lighting could reduce U. S. energy consumption for lighting by 29 percent by 2025. LEDs don’t emit heat, so they’re also more energy efficient. And they’re much harder to break.

　　6 Quantum dot mixtures could be painted on just about anything5 and electrically excited to produce a rainbow of colors t including white. The main light source of the future will almost surely not be a bulb. It might be a table, a wall, or even a fork.

　　词汇: LED /7eli: 5di:/ = light-emitting diode发光二极管 architectural /7B:ki5tektFErEl/adj.建筑的 crystal /5kristl/n.晶体 polyurethane /7pCli5juEriWein/n.聚亚安酯 obsolete /5CbsEli:t/adj.过时的，被淘汰的 quantum /5kwCntEm/n.量子 flashlight /5flAFlaIt/n.手电筒 lumpy /5lQmpi/adj.粗糙的 vibrant /5vaibrEnt/adj.(颜色)鲜明的 batch /bAtF/n.一批

　　注释:

　　1. bright invention：聪明的发明

　　2. graduate student：研究生

　　3. Quantum dots contain anywhere from 100 to 1,000 electrons：量子点含 100～1000个电子不等。Anywhere是“限定范围内的)任何一点”。又如： His monthly salary is anywhere between 3,000 yuan to 5,000 yuan. 他的月工资在 3000～5000之间。

　　4. The quantum dots were supposed to emit blue light：按常规，量子点会发出蓝光。 be supposed to是“被期望(按规则、惯例)做某事”。又如： They were supposed to have finished writing the report three days ago.他们三天前就写完那份报告。

　　5. just about anything：几乎任何东西 about = almost。

　　　5. Unlike traditional lighting, LEDs do not give out heat so .

　　6. Edison’s bright invention is likely to be outdated because .

　　7. Something unexpected happened during Bower’s experiment when .

　　8. Over one quarter of energy consumption for lighting could be saved by 2025 if .

　　A traditional lighting is less durable and dearer B a laser excited the quantum dots C America adopted LEDs D graduate students work hard E quantum dot mixtures are magic F it is more efficient

　　答案与题解 :

　　1. B 第一段的第一、第二句是关键。第一句说 LED照明经济实惠，经久耐用。第二句说爱迪生的发明将被淘汰。其意思是 LED将取代传统照明源，所以， B是答案。

　　2. E Bowers做实验，目的并非寻找新照明源。量子点在激光的激发下发出白光是一次意外的发现。段中用了 “unexpected”和“ surprised”都说明了这一点。第一段的“ accidental discovery”也佐证了这是一次偶然的发现。因此， E是答案。

　　3. D 第五段列举了应用 LED照明的不少优点，如强亮度、经久耐用、低能量消耗、不易碎等。选项 D的“LED lighting has many advantages”概括了本段的大意，所以是答案。

　　4. C由于有了量子点混合剂涂料，几乎任何物体都能用于照明。这是本段的中心思想。所以， C是答案。

　　5. F 题干涉及的内容在第五段可以找到，有关的句子是：“ LEDs don’t emit heat, so they’re also more energy efficient”，很明显。 F是答案。

　　6. A 选 A的依据是第一段的第一、第二句。

　　7. B与题干有关的内容在第三段第二、第三句中可以找到。根据这两句表达的意思， B是答案。

　　8. C 题干的“29 percent of energy consumption for lighting could be saved by 2025”可在第五段第二句中找到。题干配上选项 C后表达的意思与该句的意思相符，所以， C是答案。

2017职称英语考试卫生类C级备考辅导六.doc

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