2022版高考英语一轮复习选修7Unit3Underthesea学案含解析新人教版.doc

2022版高考英语一轮复习选修7Unit3Underthesea学案含解析新人教版.doc

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时间:2021-06-19

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1、优选Unit3Underthesea————[单元主题语境]———人与自然之人与环境、人与动植物(2019·高考卷)话题:气候变暖与海洋颜色变化 词数:274 难度:★★★★Bytheendofthecentury,ifnotsooner,theworld'soceanswillbebluerandgreenerthankstoawarmingclimate,accordingtoanewstudy.Attheheartofthephenomenonlietinymarinemicroorganisms(海洋微生物)calledphyto

2、plankton.Becauseofthewaylightreflectsofftheorganisms,thesephytoplanktoncreatecolourfulpatternsattheoceansurface.Oceancolourvariesfromgreentoblue,dependingonthetypeandconcentrationofphytoplankton.Climatechangewillfuelthegrowthofphytoplanktoninsomeareas,whilereducingitinoth

3、erspots,leadingtochangesintheocean'sappearance.Phytoplanktonliveattheoceansurface,wheretheypullcarbondioxide(二氧化碳)intotheoceanwhilegivingoffoxygen.Whentheseorganismsdie,theyburycarboninthedeepocean,animportantprocessthathelpstoregulatetheglobalclimate.Butphytoplanktonarev

4、ulnerabletotheocean'swarmingtrend.Warmingchangeskeycharacteristicsoftheoceanandcanaffectphytoplanktongrowth,sincetheyneednotonlysunlightandcarbondioxidetogrow,butalsonutrients.StephanieDutkiewicz,ascientistinMIT'sCenterforGlobalChangeScience,builtaclimatemodelthatprojects

5、changestotheoceansthroughoutthecentury.Inaworldthatwarmsupby3℃,itfoundthatmultiplechangestothecolourofthe-18-/18优选oceanswouldoccur.Themodelprojectsthatcurrentlyblueareaswithlittlephytoplanktoncouldbeeevenbluer.Butinsomewaters,suchasthoseoftheArctic,awarmingwillmakeconditi

6、onsriperforphytoplankton,andtheseareaswillturngreener.“Notonlyarethequantitiesofphytoplanktonintheoceanchanging,”shesaid,“butthetypeofphytoplanktonischanging.”Andwhydoesthatmatter?Phytoplanktonarethebaseofthefoodweb.Ifcertainkindsbegintodisappearfromtheocean,Dutkiewiczsai

7、d,“itwillchangethetypeoffishthatwillbeabletosurvive.”Thosekindsofchangescouldaffectthefoodchain.Whatevercolourchangestheoceanexperiencesintheingdecadeswillprobablybetoogradualandunnoticeable,buttheycouldmeansignificantchanges.“It'llbeawhilebeforewecanstatisticallyshowthat

8、thechangesarehappeningbecauseofclimatechange,”Dutkiewiczsaid,“butthechangeinthecolouroftheoceanw

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