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
15
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/bIXO777K
0
在职攻硕英语联考
相关试题推荐
Thedifferencebetweenaliquidandagasisobvious【C1】______theconditionsoftemperatureandpressurecommonlyfoundatthes
Consumersandproducersobviouslymakedecisionsthatmoldtheeconomy,butthereisathirdmajor【C1】______toconsidertherole
Bigcitiestodayareconfrontedwithveryseriousproblems.Transportisa【C1】______difficulty:someplannersbelievein【C2】____
AIDSiscausinggreatpublicconcernbecausethe______fataldiseasehitsprimarilyyoungpeople.
Peoplethinkingabouttheoriginoflanguageforthefirsttimeusuallyarriveattheconclusionthatitdevelopedgraduallyas
Peoplethinkingabouttheoriginoflanguageforthefirsttimeusuallyarriveattheconclusionthatitdevelopedgraduallyas
Peoplethinkingabouttheoriginoflanguageforthefirsttimeusuallyarriveattheconclusionthatitdevelopedgraduallyas
Hisofficeis______tothePresident’s;itusuallytakeshimaboutthreeminutestogetthere.
Today,theTowerofLondonisoneofthemostpopulartourist【C1】______andattractso-verthreemillionvisitorsayear.Itwas
随机试题
当归四逆汤所治厥逆的病机是
根据现行国家标准《建筑设计防火规范》(GB50016),关于疏散走道设置的说法,错误的有()。
A.维生素AB.维生素D2C.维生素D1D.维生素B2E.维生素B6
黄某和张某共同贩卖毒品,黄某被当场抓获并拘留,张某住逃。有关部门的下列哪一做法是正确的?()
工程施工过程中应当采取消防安全措施,下列说法中错误的是()。
安全事故发生后,现场有关单位和人员不得破坏事故现场、毁灭相关证据。有()原因时,需要移动事故现场物件的,应当做出标志,绘制现场简图并做出书面记录,妥善保存现场重要痕迹、物证。
固定资产盘亏,应先转入“待处理资产损溢”账户,批准处理后根据具体原因分别转入“管理费用”、“营业外支出”等账户。()
新保单的初始佣金有不同的表现形式,常用的形式包括( )。Ⅰ.每1000元保额支付A元佣金Ⅱ.首年度保费的B%Ⅲ.首年度保费的C%,且不超过每1000元保额支付D美元的总额Ⅳ.首年度保费的E%加上F元Ⅴ.趸缴保费的G%
单位安排职工到会议室听报告。如果每3人坐一条长椅,那么剩下48人没有坐;如果每5人坐一条长椅,则刚好空出两条长椅。听报告的职工有多少人?()
在一项集体比赛中,你带领的队伍进入了复赛。在比赛前你听到队员聊天。认为团队人员安排不合理。还有关于你的毫无根据的花边新闻。请问作为队长你该怎么办?
最新回复
(
0
)