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
80
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.
Why does the author mention "
Indian mustard
"?
选项
A、To warn about possible risks involved in phytoremediation
B、To help illustrate the potential of phytoremediation
C、To show that hyperaccumulating plants grow in many regions of the world
D、To explain how zinc contamination can be reduced
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/lGfO777K
0
托福(TOEFL)
相关试题推荐
Completethenotesbelow.Areasdealtwith:【L1】______northsuburbsRent:from【L2】£______to£______am
Labelthediagrambelow.ChooseTHREEanswersfromtheboxandwritethecorrectletter,A-E,nexttoquestions11-13.Aelectri
Whatinformationwasgivenbyeachwriter?ChooseyouranswersfromtheboxandwritethelettersA-FnexttoQuestions24-27.A
Completethenotesbelow.WriteONEWORDONLYforeachanswer.EngineeringforsustainabledevelopmentTheGreenhou
CompletethenotesbelowWriteONEWORDONLYforeachanswer.TheGherkinBuildingCommissionedby:【L31】______firmcalledFoste
Choosethecorrectletter,A,BorC.ProjectonusingnaturaldyestocolourfabricsWhendoinghisexperiments,Jimwassurpr
Completethenotesbelow.WriteONEWORDONLYforeachanswer.DevelopmentStudiesDevelopmentStudiesattemptstounderstand-
Althoughallsedimentaryrockscontainiron,(butthedeposits)that(arerichest)iniron(consist)predominantlyofminerals(
InfluenzaandVaccinesThereisnospecificcureforinfluenza.Recommendedtreatmentusuallyconsistsofbedrestandincre
随机试题
组合逻辑电路的译码器的功能有()。
局域网的网络拓扑结构可能分成_______、环型网和星型网等。
关于法院制作的调解书,下列哪一说法是正确的?(2015年卷三42题)
某宗房地产交易,买方实际付给卖方3900元/m2,并约定买卖中的所有税费均由卖方负担,根据调查,该地区房屋买卖中买方应缴纳的税费为正常成交价格的5%,卖方应缴纳的税费为正常成交价格的7%,则该宗房地产的正常成交价格为()元/m2。
项目监理机构实施工程造价控制的工作内容有()。
下列财产中,属于债务人财产的有()。
A、 B、 C、 D、 B从右上角的方格开始按顺时针方向每个方格内部依次发生变化得到下一个图形,变化规律为方格内线条顺时针旋转90度。第五个图形应由第四个图形左上角方格内线条顺时针旋转90度得到。故本题选B。
Theaveragepriceofallgoodsandserviceshasrisenabout50percent.Butthepriceofacollegeeducationhasnearlydoubled
在筛选时,不需要输入筛选规则的方法是()。
Asfarassymbolsofaresurgentcountry—andcity—go,therecanbefewasbullishasa666-meter-long(2,185feet)dragon-shapedb
最新回复
(
0
)