Unit5+A+Delicate+World++Starting+Out 高中英语外研版（2019）选择性必修第二册.pptxVIP

Icanseebaregroundwithtreescutdown

andalmostnograss.

Whatwillhappeninsuchaplace?

Therewillbesomedisasters,like

soilerosion,drought,desertification….

Lookatthebottom

Whatcanyousee?

Unit5ADelicateWorld

easilydestroyed

picture

page

49

in

VocabularyinVideo

1.ecosystem

2.biodiversity

3.onceinawhile

4.goextinct

5.satellite

6.delicate

生态系统

生物多样性

偶尔

灭绝

卫星

脆弱的

Connectedtogether

Activity1:Watchavideoandthinkthefollowingquestions:1.ArehumanspartofEarthsecosystems?Why?

Yes.HumansarepartofEarthsecosystems.Becauseallthelivingthingsliveinecosystemsandpeoplearelivingthings.

2.Inwhatwayscanhumansaffectecosystems?

Humanscanaffectecosystemsinpositiveandnegativeways.Forexample,tohaveapositiveinfluenceonecosystems,

peoplecanplanttrees,feedandprotectanimals,recyclethings,etc.However,deforestation,airandwaterpollutionandexcessivewasteaffectecosystemsinanegativeway.

NewPhrasesoftheUnit:

failtodo失败做某事

inharmonywith与…和谐相处

developanappetit对.f产生兴趣beintroducedt被引入

soilerosio生壤流失

NewPhrasesoftheUnit:

outofcontr安控

removefrom从….移除

decreasefrom..从…减少到. inconsequenc因此，结果

turnout结果是，证明是

NewPhrasesoftheUnit:

asubstantialnumber大量的

onceandforall一劳永逸的

everylast每一个

Oweitto...todo做……是有必要的 coexistwith与.……共存

Activity2:Lookatthesatelliteimagesandanswerthequestions.

1.Whatishappeningtothearea

accordingtothesatelliteimages?

AralSeaisbecomingsmaller

andsmaller/shrinking.

2.Whatdoyouthinkalater

satelliteimagewouldshow?

Thewaterareamay