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
专升本
Computers may one day turn night into day—with good old, natural sunlight. Colossal computer-controlled mirrors, thousands o
Computers may one day turn night into day—with good old, natural sunlight. Colossal computer-controlled mirrors, thousands o
admin
2015-10-30
77
问题
Computers may one day turn night into day—with good old, natural sunlight.
Colossal computer-controlled mirrors, thousands of feet across, may one day orbit the earth, reflecting sunlight onto a darkened United States.
Some scientists say that 16 of these mirrors, each about a half mile across could aim their reflected light at one area on the earth that was about 200 miles by 300 miles. That much light would equal about 56 moons.
The mirrors would be so high that they could catch the sun’ s light as it was shining on the other side of the earth. The mirrors could orbit—thousands of miles high—at the same speed as the earth turns on its axis(轴). That way, the mirrors would always be over the same spot.
The aluminum-coated(涂铝的), plastic mirrors could be folded up and packed into a space-ship, according to the scientists.
Once released a few hundred miles in space, the mirrors, powered by a solar-powered engine, could make the rest of the trip into space on their own.
The scientists say that the computer-controlled mirrors could also be made to tilt(倾斜)slowly, so the reflected sunlight would sweep slowly along the surface of the earth. For example, as night fell, the mirrors could be tilted to light up Boston. Later on, as darkness spread slowly west-ward, Chicago, for example, then San Francisco could be lit up. The reflected sunlight would allow these cities to save up electricity. And in emergencies, such as power-failures, the mirrors could light up the affected area.
What no one knows yet is what effect this artificial daytime would have on plants, animals, and humans. Would it confuse some animals and harm plants that are used to regular day-night cycles? The scientists recommend that studies be done to find out what bad effects there might be.
The purpose for turning night into day is to______.
选项
A、confuse animals and plants
B、light up more cities
C、save energy and deal with emergencies
D、enable people to work longer hours
答案
C
解析
根据第六段最后两句“The reflectedsunlight would allow these cities to save upelectricity.And in emergencies,such as power—failures,the mirrors could light up the affectedarea.”因此C项正确。
转载请注明原文地址:https://kaotiyun.com/show/JAYC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
ManypeoplebelievethatAmericanslovetheircarsalmostmorethananythingelse.Theyare【21】aboutcars.Notonlyisthecart
Startedin1636,HarvardUniversityistheoldestofallthemanycollegesanduniversitiesintheUnitedStates.Yale,Princet
It’sanannualback-to-schoolroutine.Onemorningyouwavegoodbye,andthat【21】eveningyou’reburningthemid-nightoilinsym
Theword"Okay"isknownandusedbymillionsofpeopleallovertheworld.Still,languageexpertsdonotagreeonwhereitcam
Threefriendsdecidedtosailaroundtheworldinasmallyacht(游艇).Theyloadeditwithfoodandwaterandsetoff.Theytravel
George:You’vegivenusawonderfulChinesedinner,Mrs.Wang.Mrs.Wang:______
TheotherdayIheardanAmericansaytoaChinesestudentofEnglish"YouspeakverygoodEnglish."Butthestudentanswered,"
Feelingtiredlately?Hasthedoctorsaidhecannotfindanythingwrongwithyou?Perhapshesentyoutoahospital,butallthe
Americansareproudoftheirvarietyandindividuality,yettheyloveandrespectfewthingsmorethanauniform,whetheritis
Eachofthestudentsinourclass______greatinterestinEnglishandtheyeach______acopyofANewEnglish-ChineseDictionary.
随机试题
人民法院对行政案件宣告判决或者裁定前,原告申请撤诉的,法院应当根据自愿原则,裁定准许。()
《移居》(其一)体现了陶渊明怎样的思想特点?
Youcanhavetoomuchofagoodthing,itseems—atleastwhenitcomestophysiotherapyafterastroke.Manydoctorsbelievetha
已知某基础工程施工双代号时标网络计划如下图所示,如果工作E实际进度延误了4周,那么施工进度计划工期延误()周。
商业银行在固定资产贷款的审批流程中应遵循的原则有()。
“一讲到底”——满堂灌;“一练到底”——满堂练;“一看到底”——满堂看;“一P(PPT)到底”——满堂放。四个“一”各有何弊端?
许多企业深受目光短浅之害,它们太关注立竿见影的结果和短期目标,以至于无法高瞻远瞩,往往使企业陷于被动甚至导致破产。因此,企业领导层的决策和行动应该以长期目标为主,不需过分关注短期目标。以下哪项如果为真,将最有力地削弱上述论证?
在一个学生表中要找出全部姓张的学生组成一个新表,应该使用的关系运算是()。
ThewholeoftheUnitedStatescheereditslatesthero,AshleySmith,withtheFederalBureauofInvestigationsayingitwaspla
Asanyonewhohastriedtoloseweightknows,realisticgoal-settinggenerallyproducesthebestresults.That’spartiallybecau
最新回复
(
0
)