九年级英语上册-Unit-5-Look-into-Science-Lesson-26-Keep-the-Candle-Burning教学讲义-(新版)冀教版.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,*,Unit 5 Look into Science,Lesson 26 Keep the Candle Burning,Think about it!,Do you think science is interesting?Why or why not?,2.Name one or two famous Chinese scientists.What do you know about them?,Lets do another experiment.,Keep the Candle Burning.,What do we need?,a c,a,ndle,蜡烛,a big glass jar,玻璃罐子,a candleholder,烛台,a sh,a,ll,ow,dish with water,浅的,m,a,tch,es,火柴,a,match,一根火柴,How do we do the experiment?,Lets read the text and fill in the blanks.,Lets,do,the,experiment,together,!,Put,the,candle,in,the,candle,holder.Put,the,candle,holder,on,the,dish.Fill,the,dish,half,full,with,water.Light,the,candle,with,a,or,a,lighter.What,can,you,see,?,The,candle,is,burning.,_,the,candle,burn,for,two,or,three,minutes.Then,carefully,put,the,jar,_,over,it,until,the,top,of,the,jar,rests,on,the,dish.As,the,candle,burns,it,the,oxygen,in,the,air.When,the,candle,stops,it,has,used,up,all,the,oxygen,in,the,air.The,water,inside,the jar,and,fills,about,of,the,jar.This,is,because,about,one,fifth,of,the,air,is,made,up,of,oxygen.,match,Let,burning,rises,What is happening?,1),分数由分子和分母两部分构成。用英语表达时，,分子用基数词，分母用序数词,。,2),如果分子为,1,，则分母的序数词是单数形式，如果分子大于,1,，则分母的序数词用复数形式。,one,(a)half,或,one second(one,-,second),=,one(a)quarter,或,one-quarter,How to express the fractions:,口 诀,:,分子基，分母序。分子,1,，分母加,s,。,二分之一,三分之一,四分之一,四分之三,五分之二,十分之九,a/one half (one second),one-third,one quarter,three-fourths three quarters,two-fifths,nine-tenths,1.Practice the text in groups.,2.Finish the exercise on page 69.,Do,the,experiment,what you want,in,groups.,Read,about,the,experiment,in,this,lesson.With,a,group,of,classmates,practice,the,experiment.Do,your,experiment,in,front,of,the,class.Dont,forget,the,following,things,:,First,describe,your,experiment.,Second,ask,the,class,what,they,think,will,happen.,Third,do,the,experiment.,Finally,ask,the,class,if,the,result,is,what,they,expected.,Write the progress in the experiment.,1.Listen and read.,2.Finish exercises of this lesson.,Homework,