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　　ScientistsinIsraelhavediscoveredanewwaytotestforwaterpollutionby"listening"towhattheplantsgrowinginwaterhavetosay．Byshiningalaserbeam(激光束)onthetinypiecesofalgae(海藻)floatinginthew

　　ScientistsinIsraelhavediscoveredanewwaytotestforwaterpollutionby"listening"towhattheplantsgrowinginwaterhavetosay．Byshiningalaserbeam(激光束)onthetinypiecesofalgae(海藻)floatinginthewatertheresearcherssaidtheyhearsoundwavesthattellthemthetypeandamountofpollutioninthewater．

　　"Itisaredlighttellingusthatsomethingisbeginningtogowrongwiththequalityofwater"saidZvyDubinskyanaquaticbiologistatIsrael'sBarIlanUniversity．"Algaeisthefirstthingtobeaffectedbyachangeinwaterquality．"

　　AswatersourcesdeteriorateworldwidethetestingofalgaecouldbeusedtomonitorwaterqualityfastermorecheaplyandmoreaccuratelythantechniquesnowinuseDubinskysaid．Thesecretistomeasuretherateofphotosynthesis(光合作用)inthealgaemeaningtheplant'sabilitytotransformlightintoenergy．Duringphotosynthesisplantsalsoreleaseoxygenintotheair．

　　Dubinsky'stechniqueiseasytoperformbecauseoftheover-abundanceofalgaeintheplanet'swater．Mostoftheoxygenintheatmospherecomesfromalgae．Aprototypetestershootsalaserbeamatwatersamplestostimulatephotosynthesisinthealgae．Butnotallofthelaser'sheatisused．

　　DependingontheconditionofthealgaeandtherateofphotosynthesissomeoftheheatisshotbackintothewatercreatingsoundwavesDubinskysaid．Withaspecialunderwatermicrophoneresearchersareabletoanalyzethestrengthofthesoundwavesanddeterminethehealthofthealgaeandtheconditionofthesurroundingwater．

　　"Algaesufferingfromleadpoisoninglikewastedischargedfrombatteryandpaintmanufacturingplantswillproduceadifferentsoundthanthosesufferingfromlackofironorexposuretoothertoxins"saidresearcherYuliaPinchasov．

　　72．Tostudywaterqualityscientistschoosealgaemainlybecause ．

　　A．algaeismosteasilyaffectedbypollution

　　B．mostoxygenisproducedbyalgae

　　C．theamountofalgaeisdecreasing

　　D．algaeisakindofplantfloatinginthewater

　　73．WhenDubinskystudiedwaterqualityhemainlyfocusedon ．

　　A．theamountoflaserusedbyalgae

　　B．therateofphotosynthesisinthealg

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2020-06-1500:33

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郭依正

　　72---75 ABCD 解析:72．A细节理解题。依据第二段Algaeisthefirstthingtobeaffectedbyachangeinwaterquality，海藻最容易对水质变化产生反应。73．B推理判断题。依据第三段第二句推断，Dubinsky主要关注海藻光合作用的进度以此来判断水质污染程度。74．C细节理解题。依据第一段theyhearsoundwavesthattellthemthetypeandamountofpollutioninthewater，知道科学家们借助于激光束产生的声波来判断水污染的类型和程度。75．D主旨概括题。本文是调查报告，依据其文体特点主题句出现在第一段。因此D项作为标题最贴切、准确。