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
94
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
Labeltheroomsonthemapbelow.Chooseyouranswersfromtheboxbelowandwritethemnexttoquestions6-10.CLComputerLabo
Whatiscurrentlythemainareaofworkofeachofthefollowingpeople?ChooseFIVEanswersfromtheboxandwritethecorrect
Choosethecorrectanswer,A,BorC.TamertonCentreTheTamertonCentrewassetupinordertoencouragepeople
Listentothedirectionsandmatchtheplacesinquestions11-15totheappropriateplaceamongA-Eonthemap.InternetUnit
Choosethecorrectletter,A,BorC.Kathyasksthetutorforhelpwiththe______section.
Whatisthemainopinionofeachofthefollowingpeople?ChooseFIVEanswersfromtheboxandwritethecorrectletter,A-G,ne
Completethenotesbelow.WriteNOMORETHANTWOWORDSforeachanswer.ROBERTSCOMPANYFoundingThemostimportantprincipa
Completethesentencesbelow.WriteNOMORETHANTWOWORDSforeachanswer.Insectsinsummercanbeharmfulbecausetheycanc
Whatdoesthepoliticiansaythegovernmentwilldointhefollowingareas?AincreaseexpenditureBmaintainthesamelevelof
随机试题
能力是在______中形成和发展的,个体的能力水平与人所从事______成正比。
男性,29岁。因心悸气促1天入院。既往有心脏病史。体检:心率170次/分,胸骨左缘第3肋间闻及4/6级收缩期杂音,伴震颤,P2亢进。患者住院期间,出现恶心、呕吐,解水样便,出现晕厥。心电图示;尖端扭转性室性心动过速。此时最急需要的化验是
公开招标,也称为(),即由业主在国内外主要报纸、有关刊物上发布招标广告,公开进行招标。
按()分类,定额可分为建筑工程定额、安装工程定额及铁路工程定额、公路工程定额、水利工程定额等。
下列机构中,不属于基金代销机构的是()。
财政投融资具有的特征是()。
个体的目标定位在获得知识和提高能力上,认为达到既定目标就是成功。根据成就目标理论,该个体所持有的成就目标属于()。(2015年)
爱德华个人偏好量表的设计采用了_____________来控制社会赞许性。
市妇联对本市8100名9到12岁的少年儿童进行了问卷调查。统计显示:75%的孩子“愿意写家庭作业”,只有12%的孩子认为“写作业挤占了玩的时间”。对于这些“乖孩子”的答卷,一位家长的看法是:要么孩子们没有说实话,要么他们爱玩的天性已经被扭曲了。以下哪一
Idon’tknowwhyhehasbeengiven______.Itwasn’thisaccomplishmentbuthiswife’s.
最新回复
(
0
)