人教版选修九Unit-4《Exploring-plants--Writing》课件.ppt

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Writing
LookatthepicturesinExercise1andguesstheanswerstothequestions:
Whatmaterialsarebeingusedinthis
experiment?
Whatdoyouthinkthepurposeoftheexperimentis?
Whatorderdoyouthinkthepicturesshouldgoin?
ListeningonP79
Numberthepicturesintheorderyouhearaboutthem.
2
3
1
5
4
Listentothefirstpartagainandanswerthequestions.
Whatisthepurposeoftheexperiment?
Tofindoutthreeimportantconditionsthatseedsneedinordertostartgrowing.
?
Ingroups.
?
Onthebench.
?
Fourdishesandfourpiecesofcloth,adishofseeds,sometapwater,someboiledwaterandsomecookingoil.
Thirdlistening
Listentothefirstpartagainandcompletethetableofconditionsthateachdishofseedswasgiven.
Conditions
DishA
DishB
DishC
DishD
tapwater,warmtemperature,oxygen
tapwater,coldtemperature,oxygen
nowater,warmtemperature,oxygen
boiledwater,oil,warmtemperature,nooxygen
Fourthlistening
.
Didtheseedsgrow?
Reasonswhyorwhynot
DishA
DishB
Yes
Becausetheyhadwater,warmthand
oxygen.
No
Becauseitwastoo
cold.