辽宁省沈阳市第二十一中学高中英语 ModuLe 5 A Lesson in a Lab Listening, speaking, Writing课件 外研版必修1.ppt

module5alessoninalab listeningandwriting doyouhavesuchanexperiencetodoanexperimentwiththehelpofateacher youwillhearaconversationinwhichateacherhelpsastudentdoanexperiment canyoupredicttheresultaccordingtotheaim listentotheconversationandcompletethedescriptionofthescientificexperiment aim apparatus tofindoutifthere sachangeinweightwhenmagnesiumburnsinair magnesium bunsenburner abalance acrucible method first putthemagnesiuminthecrucible thenputthecrucibleonthebalanceandweighit next heatthemagnesium lightthebunsenburnerandholdthecrucibleoverit finally weighthemagnesiumagain result conclusion itweighsalittlemorethanbefore thereisachangeinweightwhenmagnesiumburnsinair speaking 英语中基数词 序数词 分数 小数和百分数的读法 readthenumbersinenglish 2212012 00120 001200 0012 000 001 twotwenty onetwohundredandonetwothousandandonetwentythousandandonetwohundredthousandandonetwomillionandone 71 29 9 600 0001 951 000 0001 101 41 4306 7 seventy onepercenttwenty ninepercentninemillion sixhundredthousandonebillion ninehundredandfifty onemillionone tenthaquarter one fourth onepointfourthreehundredandsixpointseven 1 基数词的读法 先说 几十 再说 几 如 23 89 b 先说 几百 再加and 再加末两位数 或末位数 如 223 416 809 twenty three eighty nine twohundredandtwenty three fourhundredandsixteen eighthundredandnine c 1 000以上的数先从后向前数 每三位数加一 千分位 第一个 号前为thousand 第二个 号前为million 第三个 号前为billion 如 1 001 4 000 9 743 174 301 750 000 000 onethousandandone fourthousand ninethousand sevenhundredandforty three a one hundredandseventy fourthousand threehundredandone sevenhundredandfiftymillion 2 序数词的读法 序数词一般以与之相应的基数词加词尾 th构成 如 tenth 第十 但下面这些基数词在变序数词时 有特别的地方 如 one two three five eight nine twelve first second third fifth eighth ninth twelfth 1 51 74 77 1097 111 onefifthoneseventhfourseventhssevententhsninety sevenonehundredandelevenths 3 分数的读法 分子用基数词 分母用序数词 分子大于1时 分母的序数词后需要加s 4 小数的读法 小数点读作point 0 50 761 2323 45 pointfivepointsevensixonepointtwothreetwenty threepointfourfive 5 百分数的读法27 45 86 twenty sevenpercent forty fivepercent eighty sixpercent 1 0002 00012 000112 000796 000 onethousand twothousand twelvethousand onehundredandtwelvethousand sevenhundredandninetysixthousand canyousaythefollowinginenglishcorrectly 988 766 688 ninehundredandeighty eightmillion sevenhundredandsixty sixthousand sixhundredandeighty eight 987 654 321 ninehundredandeighty sevenmillion sixhundredandfifty fourthousand threehundredandtwenty one nowlet ssay 2 55 89 103 85 6 two fifths five eighths nine tenths three eighths five sixths readthesequestionsaloudandsaytheanswers whatis of6 000 000 2 howmuchis35 246 000plus12 800 000 3 whatis25 of200 000 000 threemillion forty eightmillion forty sixthousand fiftymillion 4 howmuchis260 408 396and5 284 700 twohundred sixty fivemillion sixhundred ninety three