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
2025-04-12
35
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 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. [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
A
解析
从文中第二段第三句可知,和地下水不同,雨水不含矿物质或盐类,因此无需化学处理,因此正确答案为A。
转载请注明原文地址:https://tihaiku.com/zcyy/4034409.html
相关试题推荐
Humanevolutionisalengthyprocessofchange______peopleoriginatedfromapeli
PeopleplanningtotravelbycartoNorthDakotainthewinterareadvisedto___
Whenmostpeoplethinkaboutchangingtheirbodyshape,theyusuallyfocuso
Whenmostpeoplethinkaboutchangingtheirbodyshape,theyusuallyfocuso
Whenmostpeoplethinkaboutchangingtheirbodyshape,theyusuallyfocuso
Whenmostpeoplethinkaboutchangingtheirbodyshape,theyusuallyfocuso
Therearethreegeneralmethodspeopleusetoexplainandunderstandtheirw
Therearethreegeneralmethodspeopleusetoexplainandunderstandtheirw
Everyyearthousandsofpeoplearearrestedandtakentocourtforshop-lift
Everyyearthousandsofpeoplearearrestedandtakentocourtforshop-lift
随机试题
Forquestions18-22,choosetheopinionorintentionexpressedWriteoneletter(
[originaltext]M:Womenwhoaremarried,havechildren,andworkfeelguiltybec
1.设计条件 如图所示为某集体宿舍洗浴间及盥洗间建筑平面图,用所提供的图例绘
下列关于更新重置成本的说法中,正确的是( )。A.价格指数法能够确定更新重置成本
小儿时期心衰发病率最高的年龄组是A.1个月以内 B.6个月以内 C.1岁以内
在证券公司自营业务的运作过程中,应明确自营部门在日常经营中()等原则。 Ⅰ.
下列关于钠泵的叙述,正确的是A.是镶嵌在膜上的通道蛋白 B.具有激素的作用
2021年11月甲公司与乙公司签订一项供销合同,由于甲公司未按合同发货,致使乙公
喷水灭火系统中,自动喷水预作用系统的特点有()。A.具有湿式系统
执行脑死亡标准的伦理意义除外A.弥补传统的死亡标准的不足 B.有利于科学地判断
最新回复
(
0
)