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
The Features of Solar and Wind Energy Solar and wind energy seem to have captured the public’s support as potentially being
The Features of Solar and Wind Energy Solar and wind energy seem to have captured the public’s support as potentially being
admin
2013-07-08
74
问题
The Features of Solar and Wind Energy
Solar and wind energy seem to have captured the public’s support as potentially being the primary or total answer to our electric power needs despite the fact that solar cells and wind energy systems don’t always provide electric power.
Solar cells and wind turbines are attractive because they are "renewables" and because they emit no C02, during operation. But because solar and wind electricity are available only part of the time that consumers demand power, they cannot provide energy " on demand", something that the public requires. We expect the lights to go on when we turn on a switch, and we do not expect our computers to shut down as nature dictates.
Large-scale electric energy Storage with hydroelectric dams is a good way to solve the problem, but when we use hydroelectric dams for electric energy storage, we reduce their electric power output, which would otherwise have been used by consumers. In other words, we suffer a loss to gain power on demand from wind and solar.
At locations without such hydroelectric dams, which are most places, solar and wind electricity systems must be backed up 100 percent by other forms of generation to ensure against blackouts. In today’s world, that backup power can only come from fossil fuels. Then the public will pay a large amount of money for solar and wind—paying once for the solar and wind system and again for the fossil fuel system.
Finally, because solar and wind have the capacity to deliver only 30 to 40 percent of their full power ratings in even the best locations, they provide a C02 reduction of less than 30 to 40 percent, considering the fossil fuels needed for the backup. That’s far less than the 100 percent that many people believe, and it all comes with a high cost.
The United States will need an array of electric power production options to meet its needs in the years ahead. Solar and wind will have their places, as will other renewables. Realistically, however, solar and wind will probably only provide a modest percentage of future US power. Some serious realism in energy planning is needed, especially from analysts who are not backing one horse or another.
What is the main idea of Para. 4?
选项
A、Solar and wind electricity system are costly.
B、Most places have no hydroelectric dams.
C、Fossil fuels can support the solar and wind energy.
D、Solar and wind systems should be abandoned.
答案
A
解析
主旨大意题。由题干定位到第四段可知,本段主要讲没有可以储存能量的大坝的地区,需要对这两种发电系统进行支持,因此实际上造成了浪费。因此[A]“太阳能和风力发电系统花费非常昂贵”符合文意。[B]“大多数地区都没有水力发电站的大坝”.这是进行本段论述所需的先决条件,故排除;[C]“矿物燃料能够支持太阳能和风力发电”,这只是本段的一个事实,故排除;[D]“应该抛弃太阳能和风力发电系统”,与本段意思不符,故排除。
转载请注明原文地址:https://kaotiyun.com/show/7zO4777K
0
考研英语一
相关试题推荐
TheoldsoftwareindustryjokeisusedinthetexttoJimCollinsseemstobelievethattrulysuccessfulmanagers
Naturalismistheviewthatthe"natural"universe,theuniverseofmatterandenergy,isallthattherereallyis.Byrulingou
Politicalcontroversyaboutthepublic-landpolicyoftheUnitedStatesbeganwiththeAmericaRevolution.(1)_____,evenbefore
Politicalcontroversyaboutthepublic-landpolicyoftheUnitedStatesbeganwiththeAmericaRevolution.(1)_____,evenbefore
Politicalcontroversyaboutthepublic-landpolicyoftheUnitedStatesbeganwiththeAmericaRevolution.(1)_____,evenbefore
TheauthorwoulddescribetheReisses’lifeasWhatdoestheauthormeanbysaying"Ifpeopleweren’tsobusy,wouldtheybea
Lookingathowfarwe’llbeabletofundtheHealthServiceinthe21stcenturyraisesanynumberofthornyissues.(46)Manyof
JoyWilliam’squirkyfourthnovelTheQuickandtheDeadfollowsthree16-year-oldmisfitsinanabnormalCharlie’sAngelsseti
Adultsmaythinktheyareprotectingchildrenfromsecondhandsmokewhentheysmokeoutsidetheirhomeoronlywhenthechildren
-Howdidyouplayinthematch?-Well,ourteamwasaheadby2tozeroduringthefirsthalf,butwe______inthelasttenminu
随机试题
()进一步将党的领导制度明确为我国根本领导制度,强调要坚持和完善党的领导制度体系,把党的领导落实到国家治理各领域各方面各环节。
引起无月经最可能的原因是该患者最适宜的处理是
用糖皮质激素治疗特发性血小板减少性紫癜,错误的是
提出按照罗马法《学说汇纂》而阐发的民法“五编制”体例编纂民法典的学派不是:()
根据《建设工程施工合同(示范文本)》,关于工程变更价款的确定程序,下列说法不正确的是()。
甲公司2009年至2012年与固定资产有关的业务资料如下。 (1)甲公司自行建造某项生产用大型设备,该设备由A、B、C、D四个部件组成,该四个部件可以以不同的方式为企业提供经济利益。建造过程中发生外购设备和材料成本7320万元,人工成本1200万元,资
下列关于消费税的表述,错误的是()。
权益资本(南京财经大学,2011)(天津商业大学,2011)
反对_________也将成为__________部长级会议共同的呼声。伴随着____________,一股保护主义暗流正在全球涌动,并对经济复苏构成了威胁。与此同时,在全球应对____________的过程中,一些发达国家威胁征收“__________”
20世纪初,列宁提出“社会主义将首先在一个或者几个国家内获得胜利”,此论断的理论依据是
最新回复
(
0
)