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
53
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://kaotiyun.com/show/R9PO777K
0
在职攻硕英语联考
相关试题推荐
Whichofthefollowingistrue,accordingtothewriter?InvestorsareinterestedinInternetretailingbecause______.
Theword"extras"usedinthisstorymeanspeoplewho______.Fortheauthor,thefirstexperienceofactinginafilmwas______
Foryearswehavebelievedwewereeitherhealthyorsick.【51】,duringthemid-1990s,scientistsdevelopedanewconceptcalled
Americanshaveagreatloveforinformalityandnowhereisthisbetterexpressedthanintheirlovefornicknames(昵称、绰号).Upon
Woman:IthinktheInternetismoreofadistractionthanabenefittostudents.Man:That’strue.______
Modernliberalopinionissensitivetoproblemsofrestrictionoffreedomandabuseofpower.Indeed,manyholdthatamancanb
Modernliberalopinionissensitivetoproblemsofrestrictionoffreedomandabuseofpower.Indeed,manyholdthatamancanb
Itisallverywelltoblametrafficjams,thecostofpetrolandthequickpaceofmodernlife,butmannersontheroadsarebe
Itisdifficulttoimaginewhatlifewouldbelikewithoutmemory.Themeaningsofthousandsofeverydayperceptions,thebases【
TheWarrantyHoldingsGroup,aEuropeanleaderinmechanicalbreakdowninsuranceandaresearcherandcommentatorontrendsinm
随机试题
“兴,百姓苦;亡,百姓苦”一语出自( )
交界性肿瘤
A、淀粉酶B、血清转氨酶C、γ-谷氨酰基转肽酶D、血清碱性磷酸酶E、肌酸磷酸激酶对诊断心肌梗死最有意义的是
若在三相异步电动机的运行中提高其供电频率,则该电动机的转速将()。
加快的成倍节拍流水施工的特点是( )。
下列各项中应建立备查簿登记的是()。
运用成本法估价的步骤包括()。
下列关于犯罪地点在刑法中的作用的表述中,正确的有()(2014年法学基础课多选第24题)
Let’skeepthefish______.
Astheworld’surbanpopulationgetsbigger,citiesarestrugglingtoprovidethebasicservicesthattheirresidentsneed.One
最新回复
(
0
)