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
84
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.
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://kaotiyun.com/show/3OQO777K
0
考博英语
相关试题推荐
TomorrowJapanandSouthKoreawillcelebrateWhiteDay,anannualeventwhenmenareexpectedtobuyagiftfortheadoredwome
"ImeanGildasandLudensarebothwise,reasonableandtactful;butnaturallythey’re______,theywanttoknowwhat’shappening
Fiftyisthegatewaytothemostliberatingpassageinawoman’slife.Childrenaremakingtestflightsoutofthenest.Parents
Whilehiseffortsweretremendoustheresultsappearedtobevery______.
Aconsiderableamountofmedicalresearchisaimedatidentifyingriskfactorsfordisease.Therationalebehindthisworkisth
Everytimeanoldbuildingistorndowninthiscountry,andanewbuildinggoesup,thegroundfloorbecomesabank.There
What______supposewouldhappenifthedirectorknewyoufeltthatway?
A、FurthermoreB、ConverselyC、AccordinglyD、NeverthelessDFurthermore表示“递进关系”;Conversely表示“完全相反的情形”;Accordingly表示“因果关系”,Neverthel
Later本题空格处前面讲的是一月份他们做的事,而此处讲的是八月和九月,因此应填Later“稍后,随后”。
随机试题
A、Lessfreedomandmoremoney.B、Morefreedomandmoremoney.C、Poorereducationandmoreresentment.D、Lessmoneyandthefilm
Childrenneedexercise.Parentsoftenworrythat【C1】________timeforathleticsorevenforjustplayingontheJungleJimisgoi
关于外用避孕药,下述不正确的是
治疗癃闭浊瘀阻塞证,应首选
经后小腹冷痛喜按,症状属于
某律师事务所指派吴律师担任某案件的一、二审委托代理人。第一次开庭后,吴律师感觉案件复杂,本人和该事务所均难以胜任,建议不再继续代理。但该事务所坚持代理。一审判决委托人败诉。下列哪些表述是正确的?
施闰章,清代诗人,字尚白,一字屺云,号愚山,又号蠖斋,晚号距斋。安徽省安庆人。()
“提出课程设置原则中首先要考虑的是国家和民族的利益。”这种观点属于
HowtoDoWellonaJobInterviewAtypicalinterview—confusing,humiliating,andnerve-racking—【T1】______inthesameroomw
A、Chancesofguessingthecorrectlottonumbers.B、Rossi’sdreamsaboutwinningthelotto.C、People’smadnessforlottogamesin
最新回复
(
0
)