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
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
2015-12-31
73
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. That way, the mirrors would always be over the same spot. The aluminium-coated, plastic mirrors could be folded up and packed into a spaceship, 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 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 westward, 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
本题问人们将夜晚变成白昼的目的是什么。根据文章第五段内容,反射的阳光可使这些城市节约用电。如果遇到类似停电这样的紧急情况,可以给这些事故地区照明。因此,本题的正确答案应是C“节约能源和应付紧急情况”。
转载请注明原文地址:https://www.kaotiyun.com/show/R9PO777K
0
在职攻硕英语联考
相关试题推荐
Inhumanhistory,peoplemigratedbecauseofallofthefollowingEXCEPT______.Thelastparagraphtellsusthat______.
Beforethesummerof2000,the54yearoldJohnHaughomcouldaccomplishjustaboutanythingatwork."Icouldmovemountainsi
Thepopulationexplosionwillleadto______.Whoisresponsiblefortheaccelerationoftheurbanizingprocessinmanydevelo
Librariesformavitalpartoftheworld’ssystemsofcommunicationandeducation.Theymakeavailableknowledgeaccumulatedthr
Foryearswehavebelievedwewereeitherhealthyorsick.【51】,duringthemid-1990s,scientistsdevelopedanewconceptcalled
Zoosareamongmankind’soldestinstitutions,datingbackatleast4,500years,andprobablymore.Acrosstheworldtheyhavebr
Woman:Whatdoyouthinkoftheidea?Man:Icouldn’tcomeupwithabetterone.Question:Whatdoesthemanmean?
Itisallverywelltoblametrafficjams,thecostofpetrolandthequickpaceofmodernlife,butmannersontheroadsarebe
Itisdifficulttoimaginewhatlifewouldbelikewithoutmemory.Themeaningsofthousandsofeverydayperceptions,thebases【
TheWarrantyHoldingsGroup,aEuropeanleaderinmechanicalbreakdowninsuranceandaresearcherandcommentatorontrendsinm
随机试题
简述诺思提出的具有一个福利或效用最大化的统治者的国家模型的三个基本特征。
一患者腰痛伴一侧下肢麻木感,查X线示:腰4~5椎间隙变窄,其下肢麻木的区域可能为
以X线检查结果作为重要诊断依据的牙髓炎是
A.清晨B.餐前C.餐中D.餐后E.睡前α-糖苷酶抑制剂适宜给药时间是
某大型水利水电工程施工过程中,承包人未通知监理机构及有关方面人员到现场验收,即将隐蔽部位覆盖,事后监理机构指示承包人采用钻孔探测进行检验,发现检查结果不合格,由此增加的费用应由()承担。
使用国家融资项目的范围不包括()
清代有学者说:“古有儒、释、道三教,自明以来,又多一教,曰小说……士大夫、农、工、商贾,无不习闻之,以至儿童、妇女不识字者,亦皆闻而如见之,是其教较之儒、释、道而更广也。”这表明()。
《神州日报》
下列叙述中正确的是()。
Whileitcannotbedeniedthatarespectableprofessionorcareerismuchmoreexcitingthantheroutineofhousehold【B1】______
最新回复
(
0
)