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
If two scientists at Los Alamos National Laboratory are correct, people will still be driving gasoline-powered cars 50 years fro
If two scientists at Los Alamos National Laboratory are correct, people will still be driving gasoline-powered cars 50 years fro
admin
2012-02-29
46
问题
If two scientists at Los Alamos National Laboratory are correct, people will still be driving gasoline-powered cars 50 years from now, giving out heat-trapping carbon dioxide into the atmosphere — and yet that carbon dioxide will not contribute to global warming.
The scientists, F. Jeffrey Martin and William L. Kubic Jr., are proposing a concept, which they have named Green Freedom, for removing carbon dioxide from the air and turning it back into gasoline.
The idea is simple. Air would be blown over a liquid solution which would absorb the carbon dioxide. The carbon dioxide would then be extracted (提取) and subjected to chemical reactions that would turn it into fuel.
Although they have not yet built a synthetic fuel factory, or even a small prototype (原型), the scientists say it is all based on existing technology.
"Everything in the concept has been built, is operating or has a close cousin that is operating," Dr. Martin said.
The Los Alamos proposal does not violate any laws of physics, and other scientists have independently suggested similar ideas.
In the efforts to reduce humanity’s emissions of carbon dioxide, three solutions have been offered: hydrogen(氢-)-powered fuel cells, electric cars and biofuels. Biofuels are gasoline substitutes produced from plants like corn or sugar cane. Plants absorb carbon dioxide as they grow, but growing crops for fuel takes up wide strips of land.
Hydrogen-powered cars emit no carbon dioxide, but producing hydrogen requires copious (大量的) energy, and if that energy comes from coal-fired power plants, then the problem has not been solved.
Electric cars also push the carbon dioxide problem to the power plant. And electric cars have typically been limited to a range of tens of miles as opposed to the hundreds of miles that can be driven on a tank of gas.
Gasoline, it turns out, is an almost ideal fuel (except that it produces CO2). If it can be made out of carbon dioxide in the air, the Los Alamos concept may mean there is little reason to switch, after all.
"It’s definitely worth pursuing," said Martin I. Hoffert, a professor of physics at New York University. Other scientists also said the proposal looked promising but could not evaluate it fully because the details had not been published.
The biggest problem with hydrogen-powered cars is that______.
选项
A、there is no cheap source of hydrogen energy
B、they may still be a cause of global warming
C、safety problems might occur in hydrogen production
D、they are not suitable for long-distance travel
答案
B
解析
根据题干中的hydrogen-powered cars将本题出处定位到第八段。该段提到,氢气动力汽车不排放二氧化碳,但是制造氢气需要大量能量,且如果这种能量来源于火力发电厂,那么,问题还是不能得到解决。由此可知,如果制造氢气需要的能量来源于排放二氧化碳的火力发电厂,那么氢气动力汽车还是会造成全球变暖,故答案为[B]。其余三项在文中未提及。
转载请注明原文地址:https://kaotiyun.com/show/Ezf7777K
0
大学英语四级
相关试题推荐
Internationalairlineshaverediscoveredthebusinesstravelers,themanorwomanwhoregularlyjetsfromcountrytocountryas
A、Somewherethatiswithinashortdistanceofcampus.B、Anapartmentwithoutfurnitures.C、Aplacewhereshecanlivealone.D、
Worriedaboutprescriptiondrugs?Howtoweighyourrisk?WhenthepainrelieverVioxxwaswithdrawnfromtheworldwidemark
A、Tomakeanappointment,B、Toaskforaninterview.C、Topromoteadvertisement.D、Tohaveanegotiation.C主旨题。四个选项都是不定式短语,可推断问题
A、Dangerous.B、Hard.C、Exciting.D、Dull.D综合推断题。文章最后提到Mostofthetime…theyseenothingmoreexcitingthantheocean,即大多数时间海岸警卫
The【B1】______profession,or"showbusiness",attractsmanyyoungpeople.【B2】______,onlyveryfewcanhopetobecomefamousand【
Scienceforself-reliancehas,inrecentyears,becomeamatterofgreatconcernforThirdWorldanddevelopingnations.Thesen
Scienceforself-reliancehas,inrecentyears,becomeamatterofgreatconcernforThirdWorldanddevelopingnations.Thesen
A、Hemeanttoinformherbutforgot.B、Hewastoobusytotaketimeouttotellthewoman.C、Hedidn’tknowtheclasswascancel
A、Hewon’tcomeatall.B、Hewillbelateasusual.C、Heisapunctualperson.D、Hewillcomeontimetonight.D对话中女士说...waitfo
随机试题
关于城市维护建设税的说法中,错误的是()
某坝面碾压施工设计碾压遍数为5遍,碾滚净宽为4m,则错距宽度为()m。
财政部制定的《会计核算软件基本功能规范》是对会计软件的()要求。
无风险收益率为5%,市场期望收益率为10%的条件下:A证券的期望收益率为12%,β系数为1.1;B证券的期望收益率为15%,β系数为1.2;那么投资者的投资策略为()。
商行存放在央行的存款准备金是中央银行的()。
布鲁纳认为,无论我们选择何种学科,都务必使学生理解该学科的基本结构。他的观点属于()。
幼儿骨头最外层的骨膜较厚,可以发生“折而不断”的现象,这种现象称为()。
根据以下情境材料,回答下列问题。2016年10月,某市公安局派出所为有效预防“两抢一盗”等各类违法犯罪案件的发生,成立了巡逻小分队,由6名民警和辅警人员组成。某日,民警张某等人在某小区健身场所巡逻时发现一男子正在翻座椅上的手提包,取出钱包便要离开。民
Shortlyaftertheaccident,two____________policemencametothespot.
Businesseslargeand【C1】______,nowrealizethatphysicalworkspaceinfluencesemployeebehaviour.【C2】______,businessesarered
最新回复
(
0
)