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
72
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
Thestudentwhowantsanewspapercareerhasmuchhardworkaheadofhimbeforehecanbecomeevenacub,orbeginningreporter.
OnthefourthThursdayofNovember,everyyear,AmericanscelebrateThanksgivingDay.Thedayisanationalholidaywhichisset
It’sanannualback-to-schoolroutine.Onemorningyouwavegoodbye,andthat【21】eveningyou’reburningthemid-nightoilinsym
It’sanannualback-to-schoolroutine.Onemorningyouwavegoodbye,andthat【21】eveningyou’reburningthemid-nightoilinsym
Theword"Okay"isknownandusedbymillionsofpeopleallovertheworld.Still,languageexpertsdonotagreeonwhereitcam
Forthispart,youareallowedthirtyminutestowriteacompositiononthetopic"HowIFinanceMyCollegeEducation".Youshou
IntheUnitedStatesthemostpopularformoffolkdancingsincetheearlydayshasbeensquaredancing.Inearlytimes,whenme
Howcanwegetridofgarbage?Dowehaveenoughenergysourcestomeetourfutureenergyneeds?Thesearetwoimportantque
Socialcustomsandwaysofbehavingchange.Thingswhichwereconsideredimpolitemanyyearsagoarenowacceptable.Justafew
Youhavebeenbadlyinjuredinacaraccident.Itisnecessarytogiveyouabloodtransfusionbecauseyoulostagreatdealof
随机试题
设矩阵求矩阵A的特征值与对应的全部特征向量.
下列不符合弥漫性膜性增生性肾小球肾炎病变特点的是
下列有关妇科腹部手术病人,术后引流管的护理内容应除外()
女性,35岁,甲状腺肿大,突眼mm,心慌、失眠,心率100次/分,血压140/90mmHg,诊断为甲亢。其突眼的主要原因是
严寒地区建筑屋面排水应采用()。
目标管理的特点包括()
“博学之,审问之,慎思之,明辨之,笃行之”出自()。
在日常工作和生活中,我们经常不知不觉地与数据中心打交道。以下各事项中,除()外,一般都需要与有关的数据中心连接进行数据处理。
A、Itisunnoticeable.B、Itisinevitable.C、Itisharmful.D、Itisirresistible.C
Sugar—FriendVSEnemyA)Sugariseverywhere.It’sinourdrinks,it’sinourfoods,andit’shiddeninplacesweneverwouldth
最新回复
(
0
)