初中九年级英语课件Lesson6 Keep the Candle Burning

Lesson26KeeptheCandleBurning学习目标一、知识目标

1．掌握下列单词：

shallowmatchburnlight2．掌握下列短语：

useupmakesth/sbdostopdoingsth

二、能力目标熟读课文，学会用英语描述实验过程。三、情感目标培养了解科学、热爱科学的意识。acandleamatchacandleholder

ashallowdishwithwaterabigglassjar

shallowmatchburnlightcandleholderoxygenone-fifth

点燃浅的火柴；比赛燃烧烛台氧气五分之一shallowoxygenlightburnone-fifth

candleholdermatch浅的火柴；比赛燃烧点燃烛台氧气五分之一1.Putthecandleinthecandleholder2.Putthecandleholderonthedish3.Fillthedishhalffullwithwater4.Lightthecandle6.Carefullyputthejaroverthecandleuntilthetopofthe

jarrestsonthedish1.Putthecandleinthecandleholder5.Letthecandleburnfortwoorthreeminutes

Whatishappening?

Asthecandleburns,itusesupoxygenintheair.Whenthecandlestopsburning,ithasusedupalltheoxygenintheair.Thewaterinsidethejarthenrises.Howfardidthewaterrise?Thereisaboutone-fifthoxygenintheair,sothewaterrisesandfillsaboutone-fifthofthejar.

1.Asthecandleburns,itusesupoxygen.

当蜡烛燃烧的时候,它耗尽了氧气.

注意：useup(用完;用光)

eg:Wehaveusedupthematches.

2.Whenthecanddlestopsburning,ithasusedupalltheoxygenintheair.

当蜡烛停止燃烧的时候，它已经耗尽了空气中所有的氧气。注意：stopdoingsth(停止做某事）

stoptodosth(停下来，去做某事）

eg:①Istoppeddoingmyhomeworkwhenmymothercamehome.

②Istoppedtodomyhomeworkwhenmymothercamehome.3.Thereisaboutone-fifthoxygenintheair,sothewaterrisesandfillsaboutone-fifthofthejar.

空气中大约有五分之一的氧气，所以水会上升到瓶子大约五分之一的位置。注意：分数表达的口诀“分子基，分母序。分子大于一，分母加‘s’。”

eg:1／3=onethird(one-third)3／5=threefifths(three–fifths)1／2=one(a)half(one-second)1／4=one(a)quarter(one-quarter)根据汉语完成下列句子：1.Doyouknowhow

？(使蜡烛燃烧）

2.Atthattimehe

（耗尽了）allhisstrength.

3.Theteacheraskedtheclass

.（停止讲话）4.Uptonowtheyhavefinished