高二英语Unit13 reading 人教版教材课件.ppt

ReadingWhatpropertiesorcharacteristicsdoyouknowaboutwater?Whatiswatermadeupof?Scanandanswerthefollowingquestions:2.Whatisthesalinityoftheearth’soceans?
Thesalinityoftheearth’soceansisaboutthirty-fivepartsperthousand,meanigthatthereareabout35grammesofdissolvedsolidsandgasesinonekilogrammeofwater.3.Howaboutdensityandheatcapacity?
Densityistherelationshipbetweenmassandvolume,measuredinkilogrammespercubicmetre.
Heatcapacityistheamountofenergyittakestoraisethetemperatureofasubstancebyonedegreecentigrade.ListencarefullyanddecideTrueorFalse
7.Purewaterhasahigherfreezingpointandlighterthansaltwater.
8.Ifasubstancehasadensity888kg/m3,itwillfloatonwater.
9.Theheatcapacityofwaterisrelativelyhigh,sothatmostanimalsdon’tlikelivinginit.10.Otherrecoursessuchasoil,gas,goldetcisaspreciousasadropofrain.
Multiplechoices2.Thewaterintheoceanisalwaysmovingbecause___.
A.thetemperatureofseawaterisrelativelyhigh.
B.water’sdensityaffectchangesinsalinityandtemperature.C.changesinsalinityandtemperaturehaveeffectonwater’sdensity.
D.watersinriversalwaysflowintotheocean.
3.Generallyspeaking,humanbeingsare______tolargeorsuddenlychangesintemperature.
A.generousB.objective
C.subjectiveD.sensitiveLanguagepoints2.alltheway
e.g.MrsWangcameallthewayhere.
王夫人径直到这儿来了。
3.…makesitanexcellentmedium…
make+n.+n.
e.g.Iwanttomakemysisterapianist.
我想使我的妹妹成为一个钢琴家。4.…makeitdifferentfrom…
makeit+adj.…
e.g.Youmustmakeitclearthatwhyyouarelateforschool.
你必须讲清楚你迟到的原因5.…ismadeupof…
e.g.Thewatermoleculeismadeupoftwohydrogenatomsandoneoxygenatom.
6.breakdown:分解,分化
e.g.Chemicalsinthebodybreakourfooddownintousefulsubstances.
人体中的化学元素把食物分解成有用的物质。7.mix….with:把…和…混起来
mixjoywithsorrow悲喜交集
8.affect:影响;使感染
e.g.Smokingaffectshealth.
9.freezing:adj.极冷的
frozen:adj.已经结冰的
afreezingglance冷淡的一瞥
10.mass:quality(质量)
themasses群众,民众
e.g.Themasseshaveboundlesscreativepower.
amassof…大量的……
e.g.Beforetherain,therewereamassofcloudsinthesky.11.…ismeasuredin…
measurev.
e.g.Whetheragirlisbeautifulornotismeasuredbyhersoul.
measuren.
e.g.Kilogrammeisth