1、第二节阅读理解梯度进阶训练（2）More than one and a half billion people around the world live without electricity. Finding better ways to bring light to the poor is the goal of researchers like David IrvineHalliday.In the late 1990s, the Canadian professor was working in Nepal when his return flight was cancelled.
2、A delay gave him time to take a fourteenday hiking trip in the Himalayas. As he tells it, one day he looked in the window of a school and noticed how dark it was. This is a common problem for millions of children around the worldand not just at school, but also at home.Many families use kerosene oil
3、 lamps. There are many problems with these lamps. They produce only a small amount of light. They are dangerous to breathe. And they are a big fire danger, causing many injuries and deaths each year.Kerosene costs less than other forms of lighting, but it is still costly in poor countries. Professor
4、 IrvineHalliday says many people spend well over one hundred dollars a year on the fuel.When he returned to Canada, he began researching ways to provide safe, clean and affordable lighting. He began experimenting with lightemitting diodes, LEDs, at his laboratory at the University of Calgary in Albe
5、rta. As a professor of renewable energy, he already knew about the technology. Lightemitting diodes are small glass lamps that use much less electricity than traditional bulbs and last much longer.Professor IrvineHalliday used a onewatt bright white LED made in Japan. He found it on the Internet and
6、 connected it to a bicyclepowered generator. He remembers thinking it was so bright, a child could read by the light of a single diode.In two thousand, after much research and many experiments, he returned to Nepal to put the systems into homes. His Light Up the World Foundation has now equipped the
7、 homes of twentyfive thousand people in fiftyone countries.Now his aim is to develop a lowercost lighting system. In January, David IrvineHalliday is leaving the University of Calgary. He has also decided to give up leadership in the Light Up the World Foundation to start a company in India.()1. The
8、re are many problems with kerosene oil lamps EXCEPT .A. producing only a small amount of lightB. being dangerous to breatheC. being very expensiveD. causing many injuries and deaths each year()2. Why did Professor IrvineHalliday begin to experiment on LEDs?A. Because he is a professor of renewable e
9、nergy.B. Because traditional lighting is dangerous.C. Because he wishes to provide safe, clean and affordable lighting for the poor.D. Because he was delayed by the cancelled return flight.()3. Compared with traditional bulbs, LEDs .A. use much more electricityB. last much longerC. cost much more mo
10、neyD. provide more colorful lighting()4. We can infer from the passage that Professor IrvineHalliday .A. actually invented LEDsB. visits the poor in the Himalayas every yearC. works in the University of CalgaryD. is still working on developing a lowercost lighting system()5. What is the main idea of
11、 this passage?A. The invention of LEDs.B. Bringing light to homes in poor countries.C. What Professor IrvineHalliday did for the poor.D. Living conditions in the Himalayas.Kill two birds with one stone. 一箭双雕。详解详析这篇文章介绍了IrvineHalliday 教授研制LED节能灯的起因及过程，还介绍了这位教授下一步的研究目标。1. C细节理解题。文章第三段内容介绍了煤油灯的危害，文章第四段
12、第一句Kerosene costs less than other forms of lighting， 可知不是很昂贵。故选C。2. C推理判断题。结合文章第四段和第五段的开头可知IrvineHalliday 教授研制该LED灯的主要目的。3. B细节理解题。根据文章第五段最后一句中的and last much longer可知该灯寿命较长。4. D推理判断题。根据文章最后一段第一句Now his aim is to develop a lowercost lighting system.可以推断出该教授正在研究的内容。5. B主旨大意题。文章介绍了IrvineHalliday 在看到贫穷地区使用煤油灯时萌发了开发节能的LED灯的过程，故本文主题为选项B。
