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
The Solar Decathlon is under way, and trams of students from 14 colleges and universities are building solar-powered homes on th
The Solar Decathlon is under way, and trams of students from 14 colleges and universities are building solar-powered homes on th
admin
2010-02-21
77
问题
The Solar Decathlon is under way, and trams of students from 14 colleges and universities are building solar-powered homes on the National Mall in Washington, D.C. in an effort to promote this alternative energy source. This week judges in this Department of Energy (DOE) sponsored event will evaluate these homes and declare one the winner. Unfortunately, for the participants, it mined on the Sept 26th opening ceremonies, and the skies over the Washington have remained mostly overcast since. However, the conditions may have made for a more revealing demonstration of solar energy than was originally planned.
Although the Solar Decathlon’s purpose is to advertise the benefits of electricity-generating solar panels and other residential solar gadgets, the bad weather has made it hard to ignore the limitations. As fate so amply demonstrated, not every day is a sunny day, and indeed DOE’s "Solar Village on the National Mall" has received very little of what it needs to nm.
Since solar is not an always available energy source, even a community consisting entirely of solar homes and businesses would still need to be connected to a constantly-running power plant (most likely natural gas or coal fired) to provide reliable electricity. For this reason, the fossil fuel savings and environmental benefits of solar are considerably smaller than many proponents suggest.
Washington, D.C. gets its share of sunny days as well, but even so, solar equipment provides only a modest amount of energy in relation to its cost. In fact, a $5,000 rooftop photovoltaic system typically generates no more than $100 of electricity per year, providing a rate of return comparable to a passbook savings account.
Nor do the costs end when the system is installed. Like anything exposed to the elements, solar equipment is subject to wear and storm damage, and may need ongoing maintenance and repairs. In addition, the materials that turn sunlight into electricity degrade over time. Thus, solar panels will eventually need to be replaced, most likely before the investment has fully paid itself off in the form of reduced utility bills.
Solar energy has always had its share of true believers willing to pay extra to feel good about their homes and themselves. But for homeowners who view it as an investment, it is not a good one. The economic realities are rarely acknowledged by the government officials and solar equipment manufactures involved in the Solar Decathlon and similarly one-sided promotions. By failing to be objective, the pro-solar crowd does consumers a real disservice.
The environmental benefits of solar power are small because ______.
选项
A、solar power plants can hardly avoid polluting their surroundings
B、most people prefer the relatively simple use of fossil fuel
C、the uses of solar energy still cannot go without fossil fuel
D、only several communities entirely consist of solar energy homes
答案
C
解析
由would still need to be connected to a constantly-running power plant (most likely natural gas or coal fired) to provide reliable electricity可知正确答案是C(太阳能用户仍然离不开矿物燃料)。
转载请注明原文地址:https://kaotiyun.com/show/ASIO777K
0
考博英语
相关试题推荐
Lookatthenotesaboutanenterprise.Someinformationismissing.YouwillhearpartofapresentationbytheInternationalMa
Mindyourhead.Pleaseallowupto30daysfromreceiptoforderfordelivery.
•Lookatthenoticebelow.ItshowsthecompanieswithofficesintheRoyalCommercialbuilding.•Forquestions6-10,decidewhi
LittletonNewsUpdateTherateofunemploymentinLittleton,asmalltowninthesouthwestofEngland,hasreachedarecord
•Readthearticlebelowaboutteam-building.•Choosethecorrectwordtofilleachgap,fromA,BorConthenextpage.•For
•Readthearticlebelowaboutteam-building.•Choosethecorrectwordtofilleachgap,fromA,BorConthenextpage.•For
Therewasasteadyriseinsalesin1990,whilein2000salesdecreasedconsiderablyduringthefirsthalfoftheperiodbefore
随机试题
下列关于高血压所致靶器官并发症的叙述,错误的是
腰椎滑脱、腰椎椎弓狭部骨不连、脊柱裂分别首选的摄影体位是
一患者吞咽困难2个月余,首选的辅助检查项目是()
国有独资企业的产权转让,应当由哪个机构审议?()。
某铁矿建设单位按照国家有关安全生产法律法规的规定,向安全生产监督管理部门提出矿山建设项目安全设施设计审查申请时,应提交必要的文件资料。下列资料中,不在提交范围的是()。
在Excel中,“工作表”中行和列分别用什么区别()。
根据个人独资企业法律制度的规定,下列关于个人独资企业法律特征的表述中,正确的有()。
古代法典中,最早将法典篇目简化为二十篇的是()
Itiseasytosaylettersarea(n)【C1】______wayforfamilymembersto【C2】______intouchwhenthechildren【C3】______school
A—limitedliabilityJ—unfaircompetitionB—businessscopeK—wholesalerC—commercialchannelsL—uncollectibleaccountD—bu
最新回复
(
0
)