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
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
2012-10-23
51
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 "lust-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.
What should be done to prevent insects from eating into the water harvesting system at the bottom?
选项
A、The two bags holding the water should be put inside the metal tank.
B、The inner bags need to be replaced every two years.
C、The water harvesting system should be built on a platform.
D、A cover should be used to prevent insects from eating it.
答案
C
解析
最后一段第一句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。国际开发企业称雨水贮存系统应该建在一个高起的平台上以防止昆虫咬穿底部进入系统,选C。
转载请注明原文地址:https://kaotiyun.com/show/pb9O777K
0
考博英语
相关试题推荐
ReformingtheSocialSecurityretirementprogramisanissueofenormouspracticalimportance.Yetitremainsthemissingpiece
ThepositionofBurleighSchoolintheEnglisheducationalsystemwouldbeverydifficulttoexplaintoaforeigner(whohas,Go
Customhasnotbeencommonlyregardedasasubjectofanygreatmoment.Theinnerworkingsofourownbrainswefeeltobeuniqu
MostpeoplewhodevelopLymedisease,atick-borneinfectionthat’sendemicinpartsoftheNortheastandMidwest,areeasilycu
Inacompetitiveandfast-pacedmodernsociety,busybusinessexecutivesareso______theirworkthattheyhardlyknowwhatthew
Theoldmusiciandecidedtomovetohercountryhome______heradvancedageandpoorhealth.
Theeasewithwhichthecandidateanswersdifficultquestionscreatestheimpressionthatshehasbeenapublicservantforyear
The______of"snake"issimplythis:aleglessreptilewithalong,thinbody.
NewcomerstoSanFranciscowhocan’tspeakEnglishhaveahardtimefindinganapartment,ajob,orhealthcare.Institutionsth
随机试题
一中年男性患者因急性阑尾炎住院治疗,手术后,主管医生为了使患者尽快恢复,给患者使用了一种比较贵的新型抗生素。但并没有同患者商量。患者发现自己需付上千元的药费,认为医生没有告诉自己而擅自做主,自己不应该负担这笔钱。在这个案例中,医生损害了患者的哪项权利
牵张反射的反射弧不直接涉及
肾阴枯竭,精不上荣可致肾虚,或虚火上炎可致
呼吸过速是指呼吸频率超过20次/分,见于发热、疼痛等病人。()
税务机关对税务登记证件实行定期验证制度,通常为()一次。
国内企业甲与外国投资者乙共同投资设立中外合资经营企业,甲出资55%,乙出资45%;如果合营企业的投资总额为1200万美元,则下列说法中,正确的是()。
甲因为男友乙不忠而生恨意,决定杀了他。某日甲把乙引到家中将毒药掺入饮料中让其喝下。乙昏迷之际,甲离家到附近的湖边准备自杀。徘徊之际,甲心生悔意,跑回家中救乙,发现乙已被家人送往医院,并脱离生命危险。对甲的处罚应()。
UML是用来对软件密集系统进行可视化建模的一种语言。UML2.0有13种图,(10)属于结构图,(11)属于行为图。(12)是活动图和序列图的混合物。(10)
ManyChinesefriendswenttotheparty.______manyChinesefriendsattheparty.
Impressionismisaformofartthatbeganinthe1870’s.Whenyoulookcloselyatanimpressionistpainting,youseelittledots
最新回复
(
0
)