首页
登录
职称英语
Each year, millions of people in Bangladesh drink ground water that has been
Each year, millions of people in Bangladesh drink ground water that has been
游客
2025-04-26
33
管理
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 nongovernmental 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 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 cost 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. [br] 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
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/4054945.html
相关试题推荐
Governmentsthatwanttheirpeopletoprosperintheburgeoningworldeconomy
Governmentsthatwanttheirpeopletoprosperintheburgeoningworldeconomy
Governmentsthatwanttheirpeopletoprosperintheburgeoningworldeconomy
Tomanypeople,ahusbandandwifealonedonotseemaproperfamily-theyneed
ThomasWolfeportrayedpeoplesothatyoucametoknowtheiryearnings,theirim
[img]2012q2/ct_ekdtm_ekdtread_1701_20126[/img]Increasingnumbersofpeople
[img]2012q2/ct_ekdtm_ekdtread_1701_20126[/img]Increasingnumbersofpeople
[img]2012q2/ct_ekdtm_ekdtread_1701_20126[/img]Increasingnumbersofpeople
Formostkindsofactivities,alargegroupofpeoplecanaccomplishmorean
Formostkindsofactivities,alargegroupofpeoplecanaccomplishmorean
随机试题
Theexaminerasksthecandidateabouthim/herself,his/herhome,workorstudies
BrownlowHall,aVictorianmansionjustoutsideSouthDean,wastotallydest
—"WhencanIcomeforthephotos?Ineedthemtomorrowafternoon."—"They_____
焊前对焊工重点审查的项目是()。A、年龄 B、焊接资格 C、技术等级 D、
Thechangeinthatvillagewasmiraculou
根据《火灾自动报警系统设计规范》GB50116—2013的规定,安全出口指示标志
美国教育家德怀特·艾伦曾说过:“如果我们使学生变得聪明而未使他们具备道德性的话,
简述教育发挥主导作用的条件。
甲公司期末存货采用成本与可变现净值孰低计量,2×19年12月31日甲公
在特别潮湿的场所、导电良好的地面、锅炉或金属容器内工作的照明电源电压不得大于(
最新回复
(
0
)