16．Years ago we said that LEDs would be something in the future．But as time goes on，LEDs have become the present because of rapidly falling prices and improving quality．We've firmly entered the LED period，as Lloyd showed with his experience of changing 100% of his lights to LEDs．
The physics Nobel Prize in 2014was given to three well-known Japanese scientists-Isamu Akasaki，Hiroshi Amano，and Shuji Nakamura-who invented the blue LED and made LEDs truly reach their potential as a mass-market light source．
As we can know，LEDs take the lead in the competition when it comes to efficiency（效率）．Most LED lights that you can buy right now can't reach the 300watt shown here，but this is what we know it can be achieved，and over the coming years we should gradually move closer to that goal．
Why was blue so important？Because without it，we couldn't make high-quality white light from LEDs．Red and green LEDs have been around for a long time but blue was really missing．Thanks to the blue LED we now can get white light sources which have very high energy efficiency and very long lifetime．
With good use of LEDs，the world's electricity used for lighting can be reduced greatly．But energy-efficiency isn't the only thing．Material efficiency is also very important for LEDs．A LED can last up to 100，000hours，compared to 10，000hours for fluorescent（荧光）lights and 1，000for incandescent bulbs （白炽灯泡）．This means that only a small part of the bulbs need to be produced over time．That can greatly reduce the costs．Using LEDs，the quality of light is also improved，so that people can better see when they're out at night．
32．Why did the author mention Lloyd's experience？D
A．To compare the prices of lights．
B．To describe the history of LEDs．
C．To tell us LEDs are still on the way．
D．To show the LEDs period has come．
33．We can get the white light fromB．
A．Red LED．
B．Blue LED．
C．Green LED．
D．Orange LED．
34．What can we know about LEDs？D
A．They first appeared in Japan．
B．They have taken place of other lights．
C．They can reach beyond the 300watt at present．
D．The inventors of blue LED won the Nobel Prize．
35．What does the last paragraph mainly talk about？C
A．The costs of LED lights．
B．The lifetime of LED lights．
C．The advantages of LED lights．
D．The material efficiency of LEDs．
分析 本文属于说明文阅读，作者通过这篇文章主要向我们描述了我们已经进入LED时代，LED灯具有许多的优点，蓝色LED的发明者也获得了诺贝尔奖．
解答 32．D．细节理解题．根据第一段We've firmly entered the LED period，as Lloyd showed with his experience of changing 100% of his lights to LEDs可知作者提到劳埃德的经历是为了显示LED时代已经到来；故选D．
33．B．细节理解题．根据第三段Why was blue so important？Because without it，we couldn't make high-quality white light from LEDs可知我们可以从蓝光二极管中得到白光；故选B．
34．D．细节理解题．根据第二段The physics Nobel Prize in 2014was given to three well-known Japanese scientists-Isamu Akasaki，Hiroshi Amano，and Shuji Nakamura-who invented the blue LED and made LEDs truly reach their potential as a mass-market light source可知蓝色LED的发明者获得了诺贝尔奖；故选D．
35．C．推理判断题．根据最后一段That can greatly reduce the costs．Using LEDs，the quality of light is also improved，so that people can better see when they're out at night可知主要讨论LED灯的优点；故选C．
点评 考察学生的细节理解和推理判断能力，做细节理解题时一定要找到文章中的原句，和题干进行比较，再做出正确的选择．在做推理判断题不要以个人的主观想象代替文章的事实，要根据文章事实进行合乎逻辑的推理判断．
