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
2014-09-19
33
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://jikaoti.com/ti/pJIYFFFM
0
在职攻硕英语联考
相关试题推荐
Wheneverweareinvolvedinacreativetypeofactivitythatisself-rewarding,afeelingovercomesus—afeelingthatwecanc
BritishpreviouscolonialpoliciesledtothespreadofEnglishacrosstheworld.ThiswideuseofEnglishhasbeenreinforcedb
WhatistrueaboutCentralParkinNewYorkCity?
ThedrasticchangesthathavetakenplaceinChinahavewonworldwide______.
HeseemedinsuchaninconsolablestatethatIdidn’tknowwhethertoleaveorstay.
A、Thearmyisinneedofbacon.B、Thearmy’sgotenoughbacon.C、Weshouldn’teatmorebacon.D、Weneedn’tbuymorebacon.D
Isitpossibletobebothfatandfit--notjustfitenoughtoexercise,butfitenoughtoliveaslongassomeonealotlighter?
Topleaseshareholdersandshoppers,Americancompaniesarepromisingtousemorerecycledmaterialsintheirproducts.It’san
Mobilityisoneofthecharacteristicsoften______executives,andtheymustaccustomthemselvestomovingquiteregularly.
Wehadn’trealizedthattherewouldbeapowercutsowewereastonishedwhenthewholehousewas_____intodarkness.
随机试题
建筑产品具有固定性、多样性、________和生产周期长等特点。
房地产项目按比较定价法制定的价目表,其步骤如下()。
若部分杆件相对线刚度如下:四层梁i=0.65;三层梁i=0.98;二层梁i=1.0。四层柱i=0.58;三层柱i=0.60;二层柱i=0.61。则四层柱DE的K=______。
张某和妻子李某2016年收入如下:(1)张某2016年3月领取个体户营业执照,经营汽车零件加工,当年取得生产经营收入100万元,生产经营成本为48万元,含子女的生活费支出8万元、从业人员工资8万元、张某本人的工资12万元、企业发生的与生产经营和家庭生活难
下列各句中,划线的成语使用不恰当的一项是()。
一、注意事项1.申论考试是对应考者阅读理解能力、综合分析能力、提出和解决问题能力、文字表达能力的测试。2.作答参考时限:阅读资料40分钟,作答110分钟。3.仔细阅读给定资料,按照后面提出的“申论要求”依次作答。二、给定资料
甲:王经理是大众汽车集团在中国的高级雇员之一。乙:怎么可能?王经理一直用丰田汽车。上述对话中,乙的陈述隐含的一个前提是()。
InAmericaalone,tippingisnowa$16billion-a-yearindustry.Arecentpollshowedthat40%ofAmericans【C1】______thepractice
Amysteriousphenomenonistheabilityofover-watermigrantstotraveloncourse.Birds,bees,andotherspeciescankeeptrack
TheancientGreeksexplained______.Whichofthefollowingstatementsistrueaccordingtothepassage?
最新回复
(
0
)