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
In an average winter, highway departments spread some ten million tons of salt to keep roads safe. The corrosive effects are wel
In an average winter, highway departments spread some ten million tons of salt to keep roads safe. The corrosive effects are wel
admin
2012-07-17
31
问题
In an average winter, highway departments spread some ten million tons of salt to keep roads safe. The corrosive effects are well known, but for years they’ve been dismissed with the argument that at around $ 25 a ton, salt is far cheaper than any alternative.
Lately, economists have added up the actual costs. The Environmental Protection Agency estimates that salt-induced road damage and vehicle corrosion cost $ 3 billion a year. That does not include damage to underground cables, which adds hundreds of millions to utility bills. Nor does it reflect the cost or salty water leaking into roadbeds, which kills evergreens and poisons streams.
The various costs probably add another $ 2 billion to the national salt bill. Scientists estimate the full economic, or "life cycle", cost for a ton of salt at $ 500, or 20 times the $ 25 purchase price. That begins to make the switch to calcium magnesium acetate (CMA), perhaps the most promising alternative, look practical. CMA costs $ 600 a ton and has minimal side effect. Some researchers believe the cost can be halved by making CMA from waste cheese whey (乳浆).
While CMA and other alternatives are being researched, many cities and states are cutting back on their use of salt.
With what topic is the passage mainly concerned?
选项
A、Salt substitute for roads.
B、The research of CMA.
C、Environmental protection.
D、Road and vehicle damage.
答案
A
解析
本题是一道问及文章主题类问题。通读全文,我们不难总结出本文的中心主题是关于为保证道路安全减少食盐的使用与寻找食盐替代品的问题。因此,本题的正确答案应是A。
转载请注明原文地址:https://kaotiyun.com/show/oIXO777K
0
在职攻硕英语联考
相关试题推荐
Althoughthespeakerwasawell-knownpersonality,hisspeechwaspoorly
Bigcitiestodayareconfrontedwithveryseriousproblems.Transportisa【C1】______difficulty:someplannersbelievein【C2】____
Sociologistsusethetermpowertorefertothecapacityofpeopleorgroupstocontrolorinfluencetheactionsofothers,whet
Sociologistsusethetermpowertorefertothecapacityofpeopleorgroupstocontrolorinfluencetheactionsofothers,whet
Peoplethinkingabouttheoriginoflanguageforthefirsttimeusuallyarriveattheconclusionthatitdevelopedgraduallyas
He______thejobbecauseitinvolvedtoomuchtraveling.
ThehistoryofAfrican—Americansduringthepast400yearsistraditionallynarrated【C1】______anongoingstruggleagainst【C2】___
Cultureisactivityofthought,andreceptivenesstobeautyandhumanefeeling.【C1】______ofinformationhavenothingtodowith
Cultureisactivityofthought,andreceptivenesstobeautyandhumanefeeling.【C1】______ofinformationhavenothingtodowith
Cultureisactivityofthought,andreceptivenesstobeautyandhumanefeeling.【C1】______ofinformationhavenothingtodowith
随机试题
简述合同公证与鉴证的相同点。
在内容和形式的矛盾运动中()
肾经循行胆经循行
A.苯丙胺B.麦角胺c.罂粟壳D.麦角胺咖啡因片E.复方樟脑酊列入精神药品第二类品种目录的是
对房地产开发企业将开发产品先出租再出售的业务的检查,凡将开发产品转作( )的,应视同销售,其租赁期间取得的价款应按租金确认收入的实现,出售时再按销售( )确认收入的实现。
操作风险包括()。
A、 B、 C、 D、 C第一组图中,前两幅图同为实线或同为虚线的部分在第三幅图中变为虚线;不同部分则变为实线。第二组图也符合这一规律,同为波浪线或同为折线的部分在第三幅图中变为一种线;不同部分则变成另一种线
明代中后期,随着工商业的发展和南北经济联系的加强,在江南地区,自宋元以来初露端倪的新的城市类型——()得到很快的发展。
设两曲线y=x2+ax+b与-2y=-1+xy3在点(-1,1)处相切,则a=_______,b=______.
Sheagreedtotakethenaughtyboyalong______hebehavedhimself.
最新回复
(
0
)