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(熒光)lights and 1,000for incandescent bulbs (白熾燈泡).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 本文屬于說明文閱讀,作者通過這篇文章主要向我們描述了我們已經(jīng)進入LED時代,LED燈具有許多的優(yōu)點,藍色LED的發(fā)明者也獲得了諾貝爾獎.
解答 32.D.細節(jié)理解題.根據(jù)第一段We've firmly entered the LED period,as Lloyd showed with his experience of changing 100% of his lights to LEDs可知作者提到勞埃德的經(jīng)歷是為了顯示LED時代已經(jīng)到來;故選D.
33.B.細節(jié)理解題.根據(jù)第三段Why was blue so important?Because without it,we couldn't make high-quality white light from LEDs可知我們可以從藍光二極管中得到白光;故選B.
34.D.細節(jié)理解題.根據(jù)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可知藍色LED的發(fā)明者獲得了諾貝爾獎;故選D.
35.C.推理判斷題.根據(jù)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可知主要討論LED燈的優(yōu)點;故選C.
點評 考察學生的細節(jié)理解和推理判斷能力,做細節(jié)理解題時一定要找到文章中的原句,和題干進行比較,再做出正確的選擇.在做推理判斷題不要以個人的主觀想象代替文章的事實,要根據(jù)文章事實進行合乎邏輯的推理判斷.