首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Weaving with Light In the Sierra Madre mountain range of west central Mexico, the native Huichol people live much the way th
Weaving with Light In the Sierra Madre mountain range of west central Mexico, the native Huichol people live much the way th
admin
2011-04-14
59
问题
Weaving with Light
In the Sierra Madre mountain range of west central Mexico, the native Huichol people live much the way their ancestors did—without electricity. That’s because it’s too expensive to string power lines to the remote mountain areas where they live. To help support themselves, the Huichol create beautiful artwork. They sell their art in cities hundreds of miles a-way from their villages. And without electricity, at home or on the road, they can only work during daylight hours. When it gets dark, they must stop whatever they’re doing.
Now, a team of scientists, designers and architects is using new technologies to provide the Huichol with light after the sun sets. The scientists’ technique involves weaving tiny electronic crystals into fabrics that can be made into clothes, bags, or other items.
By collecting the sun’s energy during the day, these lightweight fabrics provide bright white light at night. Their inventors have named the fabrics "Portable Lights,"Portable Lights have the potential to transform the lives of people wrthout electricity around the world, says project leader Sheila Kennedy.
"Our invention,"Kennedy says,"came from seeing how we could transform technology we saw every day in the United States and move it into new markets for people who didn’t have a lot of money."
At the core of Portable Light technology are devices called high - brightness light -emitting diodes, or HB LEDs. These tiny lights appear in digital clocks, televisions and streetlights.
LEDs are completely different from the light bulbs. Most of those glass bulbs belong to a type called incandescent lights. Inside, electricity heats a metal coil to about 2,200 degrees Celsius. At that temperature, bulbs give off light we can see.
Ninety percent of energy produced by incandescent lights, however, is heat and invisible. With all that wasted energy, bulbs burn out quickly. They are also easily broken.
LEDs, on the other hand, are like tiny pieces of rock made up of molecules that are arranged in a crystal structure. When an electric current passes through an LED, the crystal structure produces light. Unlike incandescent bulbs, they can produce light of various colors. Within an LED, the type of molecules and their particular arrangement determines what color is produced.
LEDs are different from light bulbs in that______.
选项
A、LEDs are made up to tiny pieces of rock
B、LEDs can send out light of different colors
C、LEDs belong to incandescent lights
D、LEDs look like crystals
答案
B
解析
本题有一定难度,关键在吃透句意,答案依据比较明显,带着题干信息词回文章定位,答案依据主要在文章最后一段第三句:Unlike incandescent bulbs,they can produce light of various colors.回来看选项,D项和原文句意相符,答案是B。
转载请注明原文地址:https://kaotiyun.com/show/r1Qd777K
本试题收录于:
职称英语理工类C级题库职称英语分类
0
职称英语理工类C级
职称英语
相关试题推荐
Common-coldSenseYoucan’tbeatit,butyoudon’thavetojoinit.Maybeitgotthename"commoncold"becauseit’smorec
Theyshouldnotsacrificeenvironmentalprotectionstofostereconomicgrowth.
FriendlyRelationswiththePeopleAround1Youdependonallthepeoplecloselyaroundtogiveyouthewarmfeelingofbelongin
Ioftendoabsent-mindedthings,particularlywhenI’mworried.
Thepresidentproposedthatweshouldbringthemeetingtoaclose.
USSignsGlobalTobaccoTreatyTheUnitedStateshastakenthefirststeptowardapprovingaglobaltobaccotreatythatprom
MorethanonemillionAmericansparticipatedinthesix-yearstudy.Sleepingforlessthan5hourseachnightisbetterthansl
MorethanonemillionAmericansparticipatedinthesix-yearstudy.Thefindingsindicatethatitisallrighttosleepfor6.5
Whenaliquidboils,itbecomesagas.
TheSpanishFluEpidemicIfyou’reworriedaboutthepossibilityofacomingbirdfluepidemic,youcantakecomfortinthef
随机试题
待估建筑物账面原值为500万元,竣工于2001年年底,耐用年限60年。2007年年底对该建筑物进行评估。从2002年到2007年的价格指数分别为6.9%、12%、15%、12%、8%、7.5%。评估人员现场勘察打分,结构、装修及设备三部分的得分分别为90、
Hebecameangry______thewomanwhostood______hisway.
∫02|x—1|dx=________.
男性,58岁,肝区持续性隐痛2个月,巩膜无黄染。查体:肝在右肋下6cm,质硬,表面不平,脾在肋下3cm。血糖偏低,红细胞计数增多,AFP>500μm/L持续5周。该患者最可能的疾病诊断是
关于1岁小儿的动作发育,不可能的是()
某人在银行存入10万元,期限两年,年利率为6%,每半年支付一次利息,如果按复利计算,两年后的本利和是()万元。
下列关于城市维护建设税的说法,正确的有()。
根据《人民警察警衔条例》第8条和第9条的规定,担任行政职务的人民警察实行职务等级编制警衔,其中办事员(警员)职可以授予以下警衔()。
某些东方考古学家是美国斯坦福大学的毕业生。因此,美国斯坦福大学的某些毕业生对中国古代史很有研究。为保证上述推断成立,以下哪项必须是真的?
Whenschoolstartseachyear,themostimportantquestiononthemindsofparentsandchildrenis,Whowillbemyteacher?Thec
最新回复
(
0
)