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
2015-12-31
44
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.
The writer implies that using salt to keep roads safe has all the following disadvantages but the fact that______.
选项
A、salt corrodes underground cables
B、salt pollutes the air
C、salt poisons streams and kills trees
D、salt damages roads and vehicles
答案
B
解析
本题是一道判断是非题。问作者暗示用盐保持道路安全有诸多不利,以下哪个不是作者暗示的不利方面。根据文章第二段内容,最近,经济学家们计算了实际花费。据环保局估计,由食盐引起的路面损坏及车辆腐蚀每年损失30亿美元。这并不包括对地下电缆的损坏,这笔损失给各项费用支出增加了数亿美元;它也不包括盐水渗入路基所致的损失费用,盐水杀死绿色植被,并且污染河流。因此,本题的正确答案应是B“食盐污染空气”,在原文中作者没有提到。
转载请注明原文地址:https://kaotiyun.com/show/HKWO777K
0
在职攻硕英语联考
相关试题推荐
Thereisnodoubtthatairpollutionisaglobalcrisis:itcausesanannualdeath【C1】______of6.5million.Thatisdoublethet
Teamshavebecomethebasicbuilding—blocksoforganizations.Recruitmentadsroutinelycallfor"teamplayers".Businessscho
Ittakescourageto______alltheoppositiontothedecisiontohavethesecorruptofficialsarrested.
Manypeoplearedisturbedbythegeneticdiversityofcancers—aninevitableconsequenceofrandomevolution.Cancertherapies【
A、Shehasn’treadthepassage.B、Shedoesn’tunderstanditeither.C、Shecannotreaditindarkness.D、Shesuggeststhattheman
Historyhasdemonstratedthatcountrieswithdifferentsocialsystemscanjoinhandsinmeetingthecommonchallengestohuman_
Welearnfromthefirstparagraphthattwosystemsofautomatedhighways______.Aspecial-purposelanesystemisprobablyadvan
Theapplesweredivided______accordingtotheageandsizeofthechildren.
Languagelearningbeginswithlistening.Individualchildrenvarygreatlyintheamountoflisteningtheydobeforetheystarts
Despiteacoolingoftheeconomy,hightechnologycompaniesarestillcryingoutforskilledworkers.TheInformationTechnology
随机试题
简述公共关系辅助决策的作用。
Hedoesn’twant______thathe’sgoingaway.
______between10℃intheearlymorningand30℃atnoon,apersonisgoingtoneedallhisclothestolivehereforjustoneday.
A.复元活血汤B.桂枝茯苓丸C.生化汤D.温经汤E.活络效灵丹(1994年第91,92题)跌打损伤,瘀血留于胁下,痛不可忍者,治宜选用()
导致消化性溃疡形成的直接原因是
患者,男性,28岁,肛瘘手术后。拟行热水坐浴,其浸泡时间为
进出境货物物品必须通过设立为海关的地点进境或出境。()
经营单位持主管海关签发的《开设银行保证金台账联系单》,向主管海关指定的()办理保证金台账设立手续。
在元代,与埃及亚历山大港并称“世界第一大港”的是:
GlobalMarketsHitbyFearsofGrowthSlowdownA)InvestorsareworriedaboutslowereconomicgrowthinChina,agloomierou
最新回复
(
0
)