辽宁省沈阳市第二十一中学高一英语（外研版必修1）课件：MODULE 5 A LESSON IN A LAB-LISTENING, SPEAKING, WRITING.ppt

1、Module 5A lesson in a labDo you have such an experience to do an experiment with the help of a teacher?You will hear a conversation in which a teacher helps a student do an experiment.Can you predict the result according to the aim?Listen to the conversation and complete the description of the scien

2、tific experiment.Aim:Apparatus:to find out if theres a change in weight when magnesium burns in air.Magnesium,Bunsen burner,a balance,a crucible.Method:First,put the magnesium in the crucible.Then put the crucible on the balance and weigh it.Next,heat the magnesium.Light the Bunsen burner and hold t

3、he crucible over it.Finally,weigh the magnesium again.Result:Conclusion:It weighs a little more than before.There is a change in weight when magnesium burns in air.英语中基数词、序数词、分数、小数和百分数的读法Read the numbers in English.1.基数词的读法：A.先说“几十”，再说“几”。如：23 89B.先说“几百”，再加and,再加末两位数（或末位数）。如：223 416 809twenty-threee

4、ighty-ninetwo hundred and twenty-threefour hundred and sixteeneight hundred and nineC.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 9,743 174,301750,000,000 one thousand and onefour thousandnine thousand,seven hundred and forty-threea(one)hundred an

5、d seventy-four thousand,three hundred and oneseven hundred and fifty million2.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 twelvefirstsecondthirdfiftheighthninthtwelfth1/5 1/74/77/10 97/111one fifthone seventhfour seventhsseven tenths ninety-seven on

6、e hundred and elevenths 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 point0.50.761.2323.45point fivepoint seven sixone point two threetwenty-three point four five5.百分数的读法27%45%86%twenty-seven percent forty-five percent eighty-six percent1,000 2,000 12,000 112,000796,000one thousandtwo thousa

7、ndtwelve thousandone hundred and twelve thousandseven hundred and ninety six thousandCan you say the following in English correctly?988,766,688nine hundred and eighty-eight million,seven hundred and sixty-six thousand,six hundred and eighty-eight987,654,321nine hundred and eighty-seven million,six h

8、undred and fifty-four thousand,three hundred and twenty-oneNow lets say:2/5 5/8 9/10 3/8 5/6two-fifthsfive-eighthsnine-tenths three-eighthsfive-sixthsRead these questions aloud and say the answers.1.What is of 6,000,000?2.How much is 35,246,000 plus 12,800,000?3.What is 25%of 200,000,000?Three milli

9、on.Forty-eight million,forty-six thousand.Fifty million.4.How much is 260,408,396 and 5,284,700?Two hundred,sixty-five million,six hundred,ninety-three thousand,ninety-six.5.What is of 1,000,500,000?Seven hundred,fifty million,three hundred,seventy-five thousand.6.What is 10%of 800,000,000?Eighty million.