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
考研
Each year, millions of people in Bangladesh drink ground water that has been polluted by naturally high levels of arsenic poison
Each year, millions of people in Bangladesh drink ground water that has been polluted by naturally high levels of arsenic poison
admin
2015-01-15
59
问题
Each year, millions of people in Bangladesh drink ground water that has been polluted by naturally high levels of arsenic poison. Finding safe drinking water in that country can be a problem. However, International Development Enterprises has a low-cost answer. This non-governmental organization has developed technology to harvest rainwater.
People around the world have been harvesting rainwater for centuries. It is a safe, dependable source of drinking water. Unlike ground water, rainwater contains no minerals or salts and is free of chemical treatments. Best of all, it is free.
The rainwater harvesting system created by International Development Enterprises uses pipes to collect water from the tops of buildings. The pipes stretch from the tops of buildings to a two-meter tall storage tank made of metal. At the top of the tank is a so-called "first-flush" device made of wire screen. This barrier prevents dirt and leaves in the water from falling inside the tank.
A fitted cover sits over the "first-flush" device. It protects the water inside the tank from evaporating. The cover also prevents mosquito insects from laying eggs in the water.
Inside the tank is a low coat plastic bag that collects the water. The bag sits inside another plastic bag similar to those used to hold grains. The two bags are supported inside the metal tank. All total, the water storage system can hold up to three-thousand-five-hundred liters of water. International Development Enterprises says the inner bags may need to be replaced every two to three years. However, if the bags are not damaged by sunlight, they could last even longer.
International Development Enterprises says the water harvesting system should be built on a raised structure to prevent insects from eating into it at the bottom. The total cost to build this rainwater harvesting system is about forty dollars. However, International Development Enterprises expects the price to drop over time. The group says one tank can provide a family of five with enough rainwater to survive a five-month dry season.
Which of the following contributes to the low-cost of using rainwater?
选项
A、Rainwater is free of chemical treatments.
B、People have been harvesting rainwater for centuries.
C、The water harvesting system is built on a platform.
D、Rainwater can be collected using pipes.
答案
A
解析
从文中第2段第3句可知,和地下水不同,雨水不合矿物质或盐类,因此无需化学处理,因此正确答案为A项。
转载请注明原文地址:https://kaotiyun.com/show/f4hi777K
0
在职申硕(同等学力)英语
相关试题推荐
某媒体的优点是可选择适当的地区和对象、可靠且有名气、时效长、传阅读者多;其缺点是广告购买前置时间长、有些发行量是无效。这类媒体是()。
现有财务管理理论研究起点的主要观点是()。
在部分实施战略计划后,比较结果与目标,并分析、研究、确定所采取的措施,这是指()。
可供战略联盟对象选择的方面有()。
Allexpertsagreethatthemostimportantconsiderationwithdietdrugsiscarefully______therisksandbenefits.
Andreahadneverseenanoldladyhitchhiking(搭车)before.However,theweatherandthecomingdarknessmadeherfeelsorryfor
Parentscannomorebefriendstotheirchildrenthanteacherscanbetotheirstudents.Fortheessenceoffriendshipisrecipr
Canyoucompressyourspeechintofiveminutesduetolimitedtimeforthemeeting?
Acompoundbreakismoreseriousthanasimpleonebecausethereismoreopportunityforlossofbloodandinfection.
Ametaphorisapoeticdevicethatdealswithcomparison.Itcomparessimilarqualitiesoftwodissimilarobjects.Withasimple
随机试题
积聚的病因有
求二次型f(x1,x2,x3)=-4x1x2+2x1x2+2x2x3经可逆线性变换所得的标准形.
患者女性,40岁,有糖尿病史10年,长期使用降血糖药,前段时间患肺结核,又合用抗结核药及退烧药,后来出现血粒细胞减少和周围神经炎。引起周围神经炎的药物最可能是
关于民事诉讼二审程序的表述,下列哪些选项是正确的?
下列关于税收优先原则的表述中,哪一项是违反我国《税收征收管理法》的?
发审委会议审核上市公司公开发行股票申请,适用特殊程序。()
下列有关原材料核算的说法中。错误的是()。(2012年)
基于数据库中的学生表成绩表、任课表:学生(学号,姓名、性别,出生日期、系名)成绩(学号,课程名,成绩)任课(课程名,任课教师名)用SQL语言中的CREATE语句创建一个含有学号,姓名、性别、系名、课程名、成绩、任课教师名的学生成绩视图。
Readthearticlebelowaboutprofit.Choosethebestsentencetofilleachofthegaps.Foreachblank8—12markoneletter(A—G
Ilovetravelingbytrain.Fast【B1】______slowlocaltrainswhichstopsateverystation,【B2】______trainstakingbusinessmen
最新回复
(
0
)