高二英语下册教案：unit13.docx

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1、Unit13ThewaterplanetⅠ.BriefStatementsBasedontheUnitAsweallknow,theearthisanoceanplanetand99%percentofthelivingspaceonearthisintheoceans.Itiswaterthatmakestheoceansuchagreatplacetolivein.Thisunitmainlydealswiththepropertiesofwaterandhowthepropertiesofwatermaket

2、heoceanbecomesoimportant.Welearnthisunittohelpstudentsnotonlyknowaboutthepropertiesofwater,butalsolearnhowtousewaterinagoodway.Besides,welearnthisunittoletstudentsrealizetheimportanceofprotectingwater.Ofcourse,itisnecessaryforstudentstomastertheimportantphrase

3、sandsentencesintheunit.MeanwhileweshouldreviewsomeimportantusageofModalVerbs.Ⅱ.TeachingGoals1.Talkaboutwaterandtheocean.2.Practisecommunicativeskills.3.ReviewModalVerbs.4.Writeanexplanationparagraph.Ⅲ.BackgroundInformationWhatLiesundertheBlueWater?Justliketheh

4、ouseswelivein,theoceanhasseveral“floorsor”layers.Differentfishliveondifferentlayersandareneighbours,thoughnotalwaysfriendlyones!Theocean’stoplayeristhesunlitzone(透光层).Itgoesdowntoaround200metersbelowwater.Thislayeriswarmandbright.Itisalsohometomostplantsandfis

5、h.Manyfishinthislayerarestreamlined,sotheycanquicklyswimfromdangerandcatchfood.Thetwilightzone(弱光层)isthenextlayerandisfromabout200to600metersbelowwater.Almostnoplantsgrowhere.Manyanimalsinthiszoneswimuptothesurfaceatnighttofeed,andmoveintodeeperwatersduringthe

6、day.Theyalsoeateachother,somanyofthemhavesharpteethandverybigmouths.Manyfishinthiszonedon’thaveastreamlinedbodybecausetheylieandwaitforpreytocometothem.Belowthetwilightlayeristhemidnightzone(无光层).Itisfrom600meterstothebottomofthesea.Thewateriscoldandcompletely

7、dark.Noplantsliveherebutmanysmallanimalscan.Manyanimalsinthetwilightandmidnightzonesproducetheirownlights.Theangler-fish(琵琶鱼)isoneofthem.Ithasabeautifullightonitsheadtoattractprey!MaybeyouhaveseenoneofthecoolestfilmsFindingNemo(《海底总动员》).DoyourememberMarlin,Nem

8、o’sfather,“borrowed”lighttohelpDoryread?Thatwasn’taflashlight,itwasafish!Theyalsouselighttofrightenenemiesandto“talk”witheachother.2.WaterAfamilyofsixneedsover20gallonsofwateraday,