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
95
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
Completethenotesbelow.Areasdealtwith:【L1】______northsuburbsRent:from【L2】£______to£______am
WhatrecommendationsdoesDrJohnsonmakeaboutthejournalarticles?ChooseyouranswersfromtheboxandwritethelettersA-G
JacksaysthatinLondonthesedays,manypeople
Whatproblemsdothespeakersidentifyforthisproject?ChooseSEVENanswersfromtheboxandwritetheletters,A-H,nexttoq
Choosethecorrectletter,A,BorC.Thestudenthastheabilityof
ChooseTWOletters,A-E.WhichTWObenefitsofthisactivitytothestudentsarementionedbytheprofessor?ATheybecomemore
Completethesentencesbelow.WriteNOMORETHANTHREEWORDSforeachanswer.Ifyouneedtofindinformationonacertainbook
Choosethecorrectletter,A,BorC.Bobbychoosesfootballasprojecttopicbecause
Completethenotesbelow.WriteONEWORDONLYforeachanswer.Episodicmemory-theabilitytorecalldetails,e.g.thetimeand
随机试题
简述静平衡调整和动平衡调整的主要区别。
3岁前的思维主要是()。
对凝血过程描述不准确的是
30岁经产妇,妊娠32周产前检查,B型超声提示胎儿发育未见异常,腹部触诊宫底部触及圆而硬有浮球感的胎儿部分,血压正常。妊娠39周,产妇要求剖宫产,正确的处理是
患者女性,68岁,高血压病史20年,持续剧烈胸痛1h,出冷汗,口服硝酸甘油不缓解,查体BPl80/100mmHg,心率80bpm,心电图示"左室肥厚,V3~V4导联T波增高而两肢对称",错误的处置是什么
建设单位办理工程竣工验收备案应提交的文件有()。
对于到期一次性还本付息法的说法中,正确的有()。
按职业性质可以把我国导游人员分为国际导游员、全程陪同导游员、地方陪同导游员和景区景点导游员。
在没有干扰的情况下,模仿一旦开始,便以几何级数的速度增长,迅速的蔓延,时尚,谣言像滚雪球一样。下列属于塔尔德模仿律的是()
Ifitwereonlynecessarytodecidewhethertoteachelementarysciencetoeveryoneonamassbasisortofindthegiftedfewan
最新回复
(
0
)