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
54
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
It’sanannualback-to-schoolroutine.Onemorningyouwavegoodbye,andthat【21】eveningyou’reburningthemid-nightoilinsym
Weareinterestedintheweatherbecauseit【21】ussodirectly—whatwewear,【22】wedo,andevenhowwefeel.Geographers,however
Infact,therewashardlyanyactivityorsocialeventthatcouldnotbesettoMusic.Weddings,births,christening,funerals,
Manysuperstitiouspeopleareafraidofblackcats.Theybelievethatblackcatshaveastrangepower.Ifablackcatcrossesth
John______becouldimprovehisexamresults,buthedidnothaveenoughtimetostudy.
Acomputercompanyhasaspecialpersonwhoanswersallquestionsthataresenttohim.Thepersonisa63yearoldman.Heisk
Manypeoplearewonderingifitissafetotalkonthephonewhiledriving.Therehavebeenquiteafewaccidentswhiledrivers
Manypeoplearewonderingifitissafetotalkonthephonewhiledriving.Therehavebeenquiteafewaccidentswhiledrivers
Asoneapproachessomecrossroads,onecomestoasignwhichsaysthatdrivershavetostopwhentheycometothemainroadahea
Youhavebeenbadlyinjuredinacaraccident.Itisnecessarytogiveyouabloodtransfusionbecauseyoulostagreatdealof
随机试题
先天性肥厚性幽门狭窄钡餐检查的特点不包括
下列关于社区卫生服务的原则中叙述错误的是
洋地黄中毒时心脏毒性最常见的临床表现是
为了有效地进行质量管理和质量控制,企业应建立质量体系,质量体系中通常包括( )等部分。
下列各项中,应通过“资本公积”科目核算的有( )。
对于出口加工区的报关,以下表述错误的是:
担任因违法被吊销营业执照、责令关闭的公司、企业的法定代表人,并负有个人责任的,自该公司、企业被吊销营业执照之日起未逾()年,不得担任公司的董事、监事、高级管理人员。
索赔、理赔应当遵循的流程是()
假释是对被判处有期徒刑、无期徒刑的犯罪分子,在执行一定刑期之后,因其认真遵守监规,接受教育改造,确有悔改表现,不致再危害社会,而附条件予以提前释放的制度。()
A类
最新回复
(
0
)