首页
登录
职称英语
In an average winter, highway departments spread some ten million tons of sa
In an average winter, highway departments spread some ten million tons of sa
游客
2025-03-19
27
管理
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. [br] 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://tihaiku.com/zcyy/4003604.html
相关试题推荐
ShipstravelingintheNorthAtlanticduringthewintermustbeconstantlywatch
Whatmightdrivingonanautomatedhighwaybelike?Theanswerdependsonwh
Whatmightdrivingonanautomatedhighwaybelike?Theanswerdependsonwh
Whatmightdrivingonanautomatedhighwaybelike?Theanswerdependsonwh
Whatmightdrivingonanautomatedhighwaybelike?Theanswerdependsonwh
Theyalwayslayinalarge______oftinnedfoodinwinterincasetheyaresnowed
TheUnitedStatesiswell-knownforitsnetworkofmajorhighwaysdesignedt
TheUnitedStatesiswell-knownforitsnetworkofmajorhighwaysdesignedt
TheUnitedStatesiswell-knownforitsnetworkofmajorhighwaysdesignedt
TheUnitedStatesiswell-knownforitsnetworkofmajorhighwaysdesignedt
随机试题
Theclimate(气候)is(Example:0)specialinEngland.Thereisnotagreat【B1】b
Itwasanallusiontowhatthescientistthoughtwasaninappropriatedistributi
Computertechnologyisadvancingsofastthatoldhardwarequicklybecomesc
Atabusinessmeetingeachpersonshookhandswitheveryotherpersonexactlyon
It’swidelyagreedthatgirlsgenerallystarttalkingearlierthanboys,an
中标后、开工前项目部的关键是()。A.工程质量目标的实现 B.编制实施性的施
A.麻黄碱B.小檗碱C.咖啡因D.槟榔碱E.罂粟碱具有升华性的是
男性,58岁,言语不清1小时伴右侧肢体活动障碍。体检:运动性失语,右侧中枢性面舌
孕妇服用氮芥类可致胎儿A.视神经损害 B.视网膜病变 C.死胎、胎儿电解质紊
根据社会保险法律制度的规定,工伤职工治疗非工伤引发的疾病,应当享受工伤医疗待遇。
最新回复
(
0
)