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
29
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.
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/A4hi777K
0
在职申硕(同等学力)英语
相关试题推荐
若以学龄前儿童为购买对象,“喜之郎”果冻布丁可选择()媒体。
某媒体的优点是大量使用、可选择适当的地区和对象、成本低;其缺点是仅有音响效果,不如电视吸引人。这类媒体是()。
ItistheinteractionAbetweenpeople,Bratherthantheeventsthatoccurintheirlives,thatCarethemainfocusDofsocialps
Formillionsofyearsbeforetheappearanceoftheelectriclight,shiftwork,all-nightcableTVandtheInternet,theEarth’s
Allexpertsagreethatthemostimportantconsiderationwithdietdrugsiscarefully______therisksandbenefits.
Nearlyeleventhousandpeoplehavebeenarrestedfordefyingthebanonstreettrading.
Whywasthehydraulicfuelpumpsealimportantforthespaceshuttle?WhichofthefollowingisNOTTRUEaccordingtowhatVoss
Parentscannomorebefriendstotheirchildrenthanteacherscanbetotheirstudents.Fortheessenceoffriendshipisrecipr
Ametaphorisapoeticdevicethatdealswithcomparison.Itcomparessimilarqualitiesoftwodissimilarobjects.Withasimple
随机试题
[A]Youarenotalone[B]Don’tfearresponsibilityforyourlife[C]Paveyourownuniquepath[D]Mostofyourfea
(非英语专业学生做)(Para.2,Passage3)Heatwaves,risingfromtheearth,meetresistanceintheatmospherefromthewatervaporthere.
孕妇血容量增加在下列哪段时间达到高峰
三尖瓣、二尖瓣、主动脉瓣、肺动脉瓣的共同作用是
李先生投资100万元于项目A,预期名义年收益率为10%。期限为5年,每季度付息一次。则该投资项目的有效年收益率为()。
农业科技进步的过程是新技术不断替代传统旧技术的过程,推动农业科技进步的外部动力有()。
根据作业成本管理原理,某制造企业的下列作业中,属于增值作业的是()。
“志不强者智不达,言不信者行不果”,在现实生活中正确的看法是()。
CultureTheculturalvaluesofacommunitygiveitanidentityofitsown./Acommunitygainsacharacterandapersonality
Asmytrainwasnotduetoleaveforanotherhour,Ihadplentyoftimetospare.Afterbuyingsome【B1】______toreadonthejour
最新回复
(
0
)