Unit 7 第4课时教学课件

Period4Thingschange!Howdothingschange?A.Listenandnumber.Thensay.Lookanddiscuss.Whatarethethingsinthepictures?icecreamballoonscandlespopcorn7Listenandnumber.1432Answerandcheck.Whatisthethingthatcanchange?Howcanitchange?Lookandread.It’sasolid.Itmeltswhenit’shot.Welikeeatingitonhotdays.Thinkandsay.Askandanswer,

then

check.Thisthing/Thesethingscanchange.It/Theycan...Howcanthesethingschange?Listenandfollow,thenanswer.It’sasolid.Itmeltswhenit’shot.Welikingeatitonhotdays.Thisisasolid.Whenwemakeithot,itgetsbig.Ittastesgood!Thesearesolids.Firemeltsthemintoaliquid.Theygetshorterandshorter.Thesearesmallsolids.Whenweputgasinthem,theygetbig.Wecanseethematparties.Whydothesethingschange?Thinkandsay.Manythingsinourlifecanchange.Wecanchangethingsbyheating,mixing,freezingorblowingintothem.Whatthingsaroundyoucanchange?...B.Makeandsay.Lookandguess.Whatarethese?bananayogurtfruitsaladstrawberryicedrinkThinkandsay.Thisstrawberryicedrinklookstasty!Whatdoweusetomakeit?Howdowemakeit?Lookandread.Shallwemakeastrawberryicedrink.Let’sputsomestrawberries,iceandwatertogether.Chooseandsay.Howcanwemakethem?bananayogurtfruitsaladShallwemake...Let’sputsome...together.C.Thinkandwrite.Readandanswer.What’sthemixture?Whatdoyouusetomakeit?Whatcolourisit?Howdoesitlook/smell?Let’smakesoup!Thisistomatoandeggsoup.Itisredandyellow.Itlooksniceandsmellsgood.Ilikeit!Shareandsay.What’syourmixture?Whatdoyouusetomakeit?Howdoyoumakeit?Whatcolourisit?Howdoesittaste/smell?Thinkandsay.MymixturebooknameofthemixturethingsIusewaystomakeittaste/smellcolour…Thinkandwrite.Let’s_________Thisis___________.Itis___________