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
考研
Starting this month, roughly one quarter of the world’s population will lose sleep and gain sunlight as they set their clocks ah
Starting this month, roughly one quarter of the world’s population will lose sleep and gain sunlight as they set their clocks ah
admin
2015-10-20
62
问题
Starting this month, roughly one quarter of the world’s population will lose sleep and gain sunlight as they set their clocks ahead for daylight saving. People may think that with the time shift, they are conserving electricity otherwise spent on lighting. But recent studies have cast doubt on the energy argument—some research has even found that it ultimately leads to greater power use.
Benjamin Franklin is credited with conceiving the idea of daylight saving in 1784 to conserve candles, but the U.S. did not institute it until World War I as a way to preserve resources for the war effort. The first comprehensive study of its effectiveness occurred during the oil crisis of the 1970s, when the U.S. Department of Transportation found that daylight saving trimmed national electricity usage by roughly 1 percent compared with standard time.
Scant research had been done since, during which time U.S. electricity usage patterns have changed as air conditioning and household electronics have become more pervasive, observes economist Matthew Kotchen of the University of California, Santa Barbara. But lately, changes to daylight saving policies on state and federal levels have presented investigators new chances to explore the before-and-after impacts of the clock shift.
In 2006 Indiana instituted daylight saving statewide for the first time. Examining electricity usage and billing since the statewide change, Kotchen and his colleague Laura Grant unexpectedly found that daylight time led to a 1 percent overall rise in residential electricity use, costing the state an extra $9 million. Although daylight time reduces demand for household lighting, the researchers suggest that it increased demand for cooling on summer evenings and heating in early spring and late fall mornings.
Not all recent analyses suggest that daylight saving is counterproductive. Instead of studying the impact daylight saving changes had on just one state, senior analyst Jeff Dowd and his colleagues at the U.S. Department of Energy investigated what effect it might have on national energy consumption, looking at 67 electric utilities across the country. In their report to Congress, they conclude that the four-week extension of daylight time saved about 0.5 percent of the nation’s electricity per day, or 1.3 trillion watt-hours in total. That amount could power 100,000 households for a year. The study did not just look at residential electricity use but commercial use as well, Dowd says. The disparities between regional and national results could reflect climate differences between states. "The effect we saw could be even worse in Florida, where air conditioning is used heavily," Kotchen suggests.
The text intends to tell us that
选项
A、daylight saving actually contributes to nationwide electricity conservation.
B、as states differ in climate, different daylight saving policies are necessary.
C、whether daylight saving can save energy or not still needs further study.
D、study of effectiveness of daylight saving policies should be conducted regularly.
答案
A
解析
主旨大意题。本文开篇指出有些研究结果对夏时制的功效提出异议,作者介绍了相关研究,并最后得出结论:尽管某些州实行夏时制用电量上升,但在全国范围内还是下降的。故选A项。
转载请注明原文地址:https://kaotiyun.com/show/HtzZ777K
0
考研英语一
相关试题推荐
On-lineServiceTwitterInSeptember2008,Twitterco-founderBizStonesaidthecompanynevermettohammeroutbusinessmo
(46)Attheendofthenineteenthcentury,arisinginterestinNativeAmericancustomsandanincreasingdesiretounderstandNa
Itistheworld’sfourth-most-importantfoodcrop,aftermaize,wheatandrice.Itprovidesmorecalories,morequickly,usingl
Advertisingisaformofselling.Forthousandsofyearstherehavebeenindividualswhohavetriedto(1)_____otherstobuyth
Advertisingisaformofselling.Forthousandsofyearstherehavebeenindividualswhohavetriedto(1)_____otherstobuyth
Advertisingisaformofselling.Forthousandsofyearstherehavebeenindividualswhohavetriedto(1)_____otherstobuyth
Advertisingisaformofselling.Forthousandsofyearstherehavebeenindividualswhohavetriedto(1)_____otherstobuyth
InOctober2002,GoldmanSachsandDeutscheBank(1)_____anewelectronicmarket(www.gs.com/econderivs)foreconomicindicest
ThecaseofSwirlunauthorizedworkerswascausedpossiblybecause______ItcanNOTbefoundfromthetextthat______
Paragraph2iswritteninthepassageWhichofthefollowingrecommendationsmightbemadebytheauthor?
随机试题
髋关节后脱位可出现的并发症是
请论述周作人散文的内容和艺术成就。
A.预防褥疮、肢体置功能位及被动关节运动,呼吸训练及排痰训练和防止泌尿系感染B.肌力训练、床上全面锻炼,坐位练习、轮椅训练,站立和步行训练,作业疗法C.痉挛、性功能障碍和疼痛D.运动功能障碍和姿势异常E.早期发现,早期康复,康复与游戏及教育
吗啡急性中毒引起的呼吸抑制,首选的中枢兴奋药是
这家麻制品厂的成立( )。清算组的职权主要有( )。
保险活动所特有的内在功能是()。
某投资项目达产年份的经营成本为11232万元(含增值税进项税额),其中:其他制造费用192万元,其他管理费用480万元,其他营业费用288万元,若产成品最低周转天数为15天,该项目达产年份流动资产中的产成品为()万元。
下列各项中不属于劳动者报酬的是()。
资产评估的基本方法有()
AlthoughJackisanEnglish,hecanspeak______fluently.
最新回复
(
0
)