初中九年級英語課件Lesson6 Keep the Candle Burning

Lesson26KeeptheCandleBurning學(xué)習(xí)目標(biāo)一、知識目標(biāo)

1．掌握下列單詞：

shallowmatchburnlight2．掌握下列短語：

useupmakesth/sbdostopdoingsth

二、能力目標(biāo)熟讀課文，學(xué)會用英語描述實驗過程。三、情感目標(biāo)培養(yǎng)了解科學(xué)、熱愛科學(xué)的意識。acandleamatchacandleholder

ashallowdishwithwaterabigglassjar

shallowmatchburnlightcandleholderoxygenone-fifth

點燃淺的火柴；比賽燃燒燭臺氧氣五分之一shallowoxygenlightburnone-fifth

candleholdermatch淺的火柴；比賽燃燒點燃燭臺氧氣五分之一1.Putthecandleinthecandleholder2.Putthecandleholderonthedish3.Fillthedishhalffullwithwater4.Lightthecandle6.Carefullyputthejaroverthecandleuntilthetopofthe

jarrestsonthedish1.Putthecandleinthecandleholder5.Letthecandleburnfortwoorthreeminutes

Whatishappening?

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

1.Asthecandleburns,itusesupoxygen.

當(dāng)蠟燭燃燒的時候,它耗盡了氧氣.

注意：useup(用完;用光)

eg:Wehaveusedupthematches.

2.Whenthecanddlestopsburning,ithasusedupalltheoxygenintheair.

當(dāng)蠟燭停止燃燒的時候，它已經(jīng)耗盡了空氣中所有的氧氣。注意：stopdoingsth(停止做某事）

stoptodosth(停下來，去做某事）

eg:①Istoppeddoingmyhomeworkwhenmymothercamehome.

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

空氣中大約有五分之一的氧氣，所以水會上升到瓶子大約五分之一的位置。注意：分?jǐn)?shù)表達(dá)的口訣“分子基，分母序。分子大于一，分母加‘s’?！?/p>

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)根據(jù)漢語完成下列句子：1.Doyouknowhow

？(使蠟燭燃燒）

2.Atthattimehe

（耗盡了）allhisstrength.

3.Theteacheraskedtheclass

.（停止講話）4.Uptonowtheyhavefinished