高中英语人教版选修七教师用书Unit+3　Under+the+sea

《高中英语人教版选修七教师用书Unit+3　Under+the+sea》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、Unit3Underthesea【美文阅读】广袤无垠的海洋，孕育了无数生命传奇，以其独有的神秘吸引着人类对其进行不懈的探索。为此，海洋科学家通常把海洋分为五个区域。现在就让我们一起了解一下吧！Theearth'soceanscanreachdepthsofupto11,000metres.ThatisdeepenoughtocoverMt.Qomolangma！Theoceansareincredibly(不可思议的)largeandcontainseveraldifferenthabitats.Tomakeiteasiertodescribethe

2、variouspartsoftheoceans，marine(海上的)scientistsusuallydividetheoceansintofivezones.Eachzoneisdifferentmainlyasaresultofhowmuchsunlightreachesit.Mostofthelifeintheoceancanbefoundinthefirstzone，whichbeginsatthesurfaceandgoesdownabout200metres.Becausethereissunlightatthislevel，plant

3、sareabletogrow.Marineanimalssuchasdolphins，sharks，seaturtlesandsealions，andofcourseavarietyoffish，liveinthesunlit(阳光普照的)partoftheocean.Itisdifficulttohidefromotheranimalsinthisarea.Thesecondzonestartsat200metresandgoesdowntoabout1,000metres.Somesunlightcanreachthislevel，butitis

4、notenoughforplantstogrow.Becausethiszoneisrelativelydark，manyofthecreaturesthatlivehereareabletomakelightwiththeirbody.Thelightfromtheseanimalsmakesthewaterlooklikeaskywithmovingstarsinit.Thethirdzoneoftheoceanisdark.Thisplace，about3,000metresdeep，maynotseemalikelyhabitat，butth

5、erearemorecreaturesherethanonemightthink.Mostoftheanimalsthatlivehereareblackorredbecauseofthelackoflight.Below4,000metres，thetemperatureisnearfreezingandthereisnolightatall.Infact，thezoneissodarkandemptythatscientistsnamedthiszoneaftertheGreekwordfor“nobottom”．Thereisnotmuchli

6、fetobefoundinthiscoldandunpleasantpartoftheocean，butsomesmallcreaturesstillmanagetosurviveheredespitethehighwaterpressure.Theverydeepestpartoftheoceanisfound2,000metresfurtherdown.Atthisdepth，thewaterpressureisextremelyhighandlifeisverydifficultforthefewcreaturesthatlivehere.Co

7、mparedtotheotherzones，thisonehasverylittlelife.Sincethereisnolighthere，someoftheanimalsdonothaveeyes.Nexttimeyoulookattheoceanfromthebeachoronamap，rememberthatwhatyouareseeingisonlythesurface－onlythebeginningofthelargeandvariedadventure.【诱思导学】1．Whydotheseanimalslivinginthesecon

8、dzonemakethewaterlooklikeaskywithmovingstarsinit?_____