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
2015-01-09
46
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 dej veloped 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 actually prevents dirt and leaves from falling inside the tank?
选项
A、a barrier
B、a wire screen
C、a first-flush
D、a storage tank
答案
B
解析
从文中第三段的最后两句可知,水箱上面有一个所谓的"first-flush"的装置,是用铁丝网做的。这一屏障能防止雨水中灰尘和树叶掉落到水箱中,而题干中出现actually"到底"一词,因此B项为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/COQO777K
0
考博英语
相关试题推荐
Afteranumberofdisagreementswiththecommittee,thechairmandecidedto______hispresentjob.
TomorrowJapanandSouthKoreawillcelebrateWhiteDay,anannualeventwhenmenareexpectedtobuyagiftfortheadoredwome
TomorrowJapanandSouthKoreawillcelebrateWhiteDay,anannualeventwhenmenareexpectedtobuyagiftfortheadoredwome
Idecidedto______betweenRalphandhisbrother,whowerearguingendlessly.
Popculturedoesn’t______tostrictrules;itenjoysbeingjazzy,unpredictable,chaotic.
Thefundamentaldistinctionbetweenaconstitutionandordinarylawsissimilartothatbetweenlawsingeneralandtheirapplic
Marybecame______homesickandcriticaloftheUnitedStates,soshefledfromherhomeinwestBloomfieldtoherhometowninAus
Onawarmsunnydaytheriverseems______andbenign,andit’shardtobelieveitcanbedangerous.
A、entireB、completeC、totalD、allA结合文意可知此处强调的是整个“Salmonindustry”。A项“entire全部的,整体的”符合文意。B项的complete强调“所有的部分或个体一个不少”;C项total意为“所
again本题空格处是说黄昏时家人们再次聚在一起。onceagain意为“再一次”。
随机试题
简述供应商关系控制过程的步骤。
Jackwasoutofmoney.Hehadacardontheboardannouncingthathehadaradioset
一般认为急性中毒洗胃的有效时间是
急性多发性龋脓肿最佳治疗方案为
IrrevocabledocumentarycreditNumber:LC123-268866Date:January2,2003Dateandplaceofexpiry:February20,2003
在假设检验中,当作出拒绝原假设而接受备择假设的结论时,表示()。
根据个人所得税相关规定,加强高收入者的财产转让所得管理的主要内容有()。
运用所学原理,分析下述观点。墨子:染于苍则苍,染于黄则黄,所入者变,其色亦变。荀子:蓬生麻中,不扶而直;白沙在涅,与之俱黑。霍尔:一两的遗传胜过一吨的教育。桑代克:人的智慧80%决定于基因,17%决定于训练,3%决定于偶然机
对下列哪些犯罪分子应当附加适用剥夺政治权利?()
Itishardtoboxagainstasouthpaw,asApolloCreedfoundoutwhenhefoughtRockyBalboainthefirstofaninterminableseri
最新回复
(
0
)