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
21
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] 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
转载请注明原文地址:https://tihaiku.com/zcyy/4054948.html
相关试题推荐
Manypeoplethinkofdesertsas______regions,butnumerousspeciesofplantsa
Travellingandmeetingnewpeople______themindofyoungpeople.A、expandedB、en
Manypeopleproposedthatanationalcommitteebeformedtodiscuss______toex
[img]2012q2/ct_ekdtm_ekdtread_1701_20126[/img]Increasingnumbersofpeople
[img]2012q2/ct_ekdtm_ekdtread_1701_20126[/img]Increasingnumbersofpeople
Formostkindsofactivities,alargegroupofpeoplecanaccomplishmorean
Formostkindsofactivities,alargegroupofpeoplecanaccomplishmorean
Formostkindsofactivities,alargegroupofpeoplecanaccomplishmorean
Formostkindsofactivities,alargegroupofpeoplecanaccomplishmorean
Formostkindsofactivities,alargegroupofpeoplecanaccomplishmorean
随机试题
OnthenorthbankoftheOhioRiversitsEvansville,Ind.,homeofDavidWi
Alansoldmostofhisbelongings.Hehasscarcely________leftinthehouse.A、eve
[img]2016m12s/ct_eyyjscm_eyyjscd_0021_201612[/img]’Diamonds’,sangMarily
MywritingwastodeveloptopicsandthemesfrommyNativeAmericanbackgrou
气功(Qigong)是中国文化的杰出遗产(legacy),也是传统中医的一个重要组成部分。它是以调心、调息、调身为手段的身心锻炼方法。气功能解乏并改善睡
_________workhasbeendonetoimprovepeople’slivingstandard.A、ManyB、Agreat
HarryHoudini,whodiedin1927,wastheentertainmentphenomenonoftherag
中国证券投资基金业协会网站公示的股权投资基金的基本情况包括()。 Ⅰ.
下列属于自然人的民事权利能力特征的有()。A.工具性 B.先在性 C.人为性
通过查看机电安装工程使用情况的回访的方式是()。A.技术性回访 B.巡回式回
最新回复
(
0
)