【阅读理解AsaresultofpollutionLakeErieonthebordersoftheUSAandCanadaisnowwithoutanylivingthings．Pollutioninwaterisnotsimplyamatterof“poisons”killinglarg】|小学英语问答-字典翻译问答网

问题标题：

【阅读理解AsaresultofpollutionLakeErieonthebordersoftheUSAandCanadaisnowwithoutanylivingthings．Pollutioninwaterisnotsimplyamatterof“poisons”killinglarg】

问题描述：

(1)

(2)

阅读理解

　　AsaresultofpollutionLakeErieonthebordersoftheUSAandCanadaisnowwithoutanylivingthings．

　　Pollutioninwaterisnotsimplyamatterof“poisons”killinglargenumbersoffishovernight．Veryoftentheeffectsofpollutionarenotnoticedformanymonthsoryearsbecausethefirstorganisms(生物体)tobeaffectedareeitherplantsorplankton．Buttheseorganismsarethefoodoffishandbirdsandothercreatures．Whenthisfooddisappearsthefishandbirdsdietoo．Inthiswayawholefoodchaincanbewipedoutandit’snotuntildeadfishandwaterbirdsareseenattheriver’sedgeorontheseashorethatpeoplerealizewhatishappening．

　　Wheredothesubstanceswhichpollutethewatercomefrom?Therearetwomainsourcesofsewage(污水)andindustrialwaste．Asmoredetergent(洗涤剂)isusedinthehomesomoreofitisfinallyputintoourriverslakesandseas．Detergentsharmwaterbirdsdissolvingthenaturalsubstanceswhichkeeptheirfeatherswater-proof．Sewageitselfifnotproperlytreatedmakesthewaterdirtyandpreventsallformsoflifeinriversandtheseafromreceivingtheoxygentheyneed．Industrialwasteisevenmoreharmfulastherearemanyhighlypoisonousthingsinitsuchascopperandlead．

　　Soifwewanttostopthispollutiontheanswerissimple：sewageandindustrialwastemustbemadeclearbeforeflowingintothewater．Itmayalreadybetoolatetosavesomeriversandlakesbutotherscanstillbesavedifthecorrectactionistakenatonce．

Pollutionofwaterisnoticed________．

[　　]

A．

whenthefirstorganismsareaffected

B．

whenagoodmanyfishandbirdsdie

C．

whenpoisonousthingsarepouredintowater

D．

assoonasthebalanceofnatureisdestroyed

李光玉回答：

　　答案：1．B;2．D;3．C;4．C; 　　解析：　　(1)从第二段可知，人们将有毒物排放到水中，水中的生物受影响，鱼、鸟死去，直到这时人们才意识到，因此选B项。(2)第三段说“污水弄脏水，使河流海洋中的各种生物都得不到它们需要的氧气”。(3)文中多次提到生活污水，家用洗涤剂的污染。(4)仅仅意识到污染还不行，必须行动，最后一段说必须将污水作无害处理。