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
Only recently have investigators considered using these plants to clean up soil and waste sites that have been contaminated by t
Only recently have investigators considered using these plants to clean up soil and waste sites that have been contaminated by t
admin
2014-09-29
55
问题
Only recently have investigators considered using these plants to clean up soil and waste sites that have been contaminated by toxic levels of heavy metals—an environmentally friendly approach known as phytoremediation.
This scenario begins with the planting of hyperaccumulating species in the target area, such as an abandoned mine or an irrigation pond contaminated by runoff.
Toxic minerals would first be absorbed by roots but later relocated to the stem and leaves. A harvest of the shoots would remove the toxic compounds off site to be burned or composted to recover the metal for industrial uses. After several years of cultivation and harvest, the site would be restored at a cost much lower than the price of excavation and reburial, the standard practice for remediation of contaminated soils. For example, in field trials, the plant alpine pennycress removed zinc and cadmium from soils near a zinc smelter, and
Indian mustard
, native to Pakistan and India, has been effective in reducing levels of selenium salts by 50 percent in contaminated soils.
It can be inferred from paragraph 6 that compared with standard practices for remediation of contaminated soils, phytoremediation
选项
A、does not allow for the use of the removed minerals for industrial purposes
B、can be faster to implement
C、is equally friendly to the environment
D、is less suitable for soils that need to be used within a short period of time
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/eGfO777K
0
托福(TOEFL)
相关试题推荐
Completethetablebelow.WriteNOMORETHANTHREEWORDSORANUMBERforeachanswer.
Whowantstodoeachoftheactivitiesbelow?AonlyJacintaBonlyLewisCbothJacintaandLewisWritethecorrectletter,A,
Choosethecorrectanswer,A,BorC.MuseumworkplacementIfstudentsareillorgoingtobelate,theymustinform
Listentothedirectionsandmatchtheplacesinquestions11-15totheappropriateplaceamongA-Eonthemap.InternetUnit
Choosethecorrectletter,A,BorC.Kathyasksthetutorforhelpwiththe______section.
Completethenotesbelow.WriteNOMORETHANTWOWORDSforeachanswer.AdvertisingEffectTheimportantfactortoconsider
Completethenotesbelow.WriteNOMORETHANTWOWORDSforeachanswer.AdvertisingEffectTheimportantfactortoconsider
Choosethecorrectletter,A,BorC.Theywanttodothisprojectbecause
Choosethecorrectletter,A,BorC.ProjectonusingnaturaldyestocolourfabricsWhendoinghisexperiments,Jimwassurpr
Completethenotesbelow.WriteONEWORDONLYforeachanswer.Episodicmemory-theabilitytorecalldetails,e.g.thetimeand
随机试题
氟哌啶醇与氯丙嗪都有抗精神病和止吐作用,但二者在作用强度和不良反应上又有所区别,以下关于二者的说法中正确的是
我国一些少数民族地区跨越封建社会和资本主义社会,从奴隶社会直接进入社会主义社会,这说明社会进步()
声波由鼓膜经听骨链到达卵圆窗膜时,振动的
A.煎煮法B.浸渍法C.渗漉法D.水蒸气蒸馏法E.超临界流体提取法
在日常运作中,目前我国基金管理公司按照()的规定管理基金资产。
对资料的分析和假设是相互联系、相互依赖的,任何一个进行得不好都会影响到调查结果的有效性及其利用。
阅读材料,回答相关问题。教科书的编写是为了更好地落实课程标准中的三维目标,教科书选取了多样化的教学内容。课程目标、内容选取与内容组织之间有密切的内在联系。教科书提供的是单纯的课程知识,在传统的课堂教学中,教师往往倾向于“封闭式
教师的哪一种领导方式对学生发展的促进作用最大?()
2012年山东省农村居民人均总收入13645.26元,同比增长12.34%。分类项目中,工资总收入4383.22元,同比增长17.98%,其中,在本乡地域内劳动得到收入2615.32元,外出就业得到收入1448.4元,同比分别增长18.79%和18.27%
在日常生活中,礼貌语言作用之大往往超出一般人的__________。当人与人之间发生这样那样的__________时,礼貌、谦让的语青会如熏风般暖人心扉,将龃龉化为乌有,令睚可变成笑靥。填入划横线部分最恰当的一项是:
最新回复
(
0
)