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.
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
本题可参照文中的最后一段。从中可知,国际发展企业说,储水系统应该建立在一个凸起的建筑上。以防止昆虫侵害它的底部。因此C项为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/xOQO777K
0
考博英语
相关试题推荐
SteveJobsisanentrepreneur.Andthatishowhistorywilllongrememberhim.Notprimarilyasafiduciaryoraninstitutionbu
TheUnitedNationsPopulationFundhaspickedOctober31asthedaytheworldwillbehometo7billionpeople.Forbettera
(1)AgiftedAmericanpsychologisthassaid,"Worryisaspasmoftheemotion;themindcatchesholdofsomethingandwillnotle
Fiftyisthegatewaytothemostliberatingpassageinawoman’slife.Childrenaremakingtestflightsoutofthenest.Parents
2009wastheworstyearfortherecordlabelsinadecade.【C1】______was2008,andbeforethat2007and2006.Infact,industryr
Hedidnotwanttobe______bythemajority.Hefeltthatvariousdistinguishedculturescouldofferagreatercontributiontopr
Theamazingsuccessofhumansasa【1】istheresultoftheevolutionarydevelopmentofourbrainswhichhasled,amongotherthin
TheordinaryfamilycolonialNorthAmericawasprimarilyconcernedwithsheerphysicalsurvivalandbeyondthat,itsowneconomi
A、possibilityB、perspectiveC、occurrenceD、opportunityApossibility意为“可能性”;perspective意为“观点,看法”;occurrence意为“事情,发生,出现”;opportuni
asleep本题空格处是说在孩子们入睡后他们就讨论白天的一些事。asleep意为“睡着的,睡熟的”。
随机试题
下列哪经病证可见肩痛
特发性肺间质纤维化的特征病变为
黄疸消退后,病体仍有气滞血瘀者,宜选用逍遥散合
A、氯化钠B、氧化锌C、无水碳酸钠D、邻苯二甲酸氢钾标定氢氧化钠滴定液的基准物质为( )。
资料一:基本情况上海机床有限责任公司(3310215031)接受国外某企业的委托制造出口机床零部件,由国外客户提供原材料铰链(属法定检验检疫和自动进口许可管理商品,法定计量单位为千克)。载运货物的运输工具于2005年7月9日申报进境,上海机
下列不属于教学模式内容的是()。
下列毛泽东的代表作中,全面表达了实事求是,群众路线和独立自主的根本观点的是()。
甲、乙为夫妻,双方父母双亡,膝下无子,甲只有一妹妹,没有其他近亲属;乙无近亲属。甲、乙在一次外出旅游中意外死亡。经查,甲、乙有共同财产40万元,则该40万元中()。
A、Themaximumnoisethatourhumanearscanputupwithis140decibels.B、Itisadvisabletolistentosomerockmusicwhenan
A、Tohelparoundfarm.B、Toentertaintourists.C、Tobesoldformoney.D、Tobeavehicle.B
最新回复
(
0
)