遼寧省沈陽市第二十一中學(xué)高中英語 ModuLe 5 A Lesson in a Lab Listening, speaking, Writing課件 外研版必修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 scientific 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 the 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.英語中基數(shù)詞、序數(shù)詞、分?jǐn)?shù)、英語中基數(shù)詞、序數(shù)詞、分?jǐn)?shù)、小數(shù)和百分?jǐn)?shù)的讀法小數(shù)和百分?jǐn)?shù)的讀法READ THE NUMBERS IN ENGLISH. 2 21 201 2,001 20,001 200,001 2,000,001twotwenty-onetwo hundred and onetwo thousand and onetwenty thousand and onetwo hundred thousand and onetwo million and one 71 29 9,600,000 1,951,000,000 1/10 1/4 1.4 306.7seventy-one percent twenty-nine percentnine million, six hundred thousandone billion, nine hundred and fifty-one millionone-tenth a quarter(one-fourth)one point fourthree hundred and six point seven1. 基數(shù)詞的讀法：基數(shù)詞的讀法：A.先說先說“幾十幾十”， 再說再說“幾幾”。如：。如：23 89B. 先說先說“幾百幾百”， 再加再加and,再加末兩位數(shù)再加末兩位數(shù)（或末位數(shù)）。如：（或末位數(shù)）。如：223 416 809 twenty-three eighty-ninetwo hundred and twenty-threefour hundred and sixteeneight hundred and nineC. 1,000以上的數(shù)先從后向前數(shù)，每三位數(shù)加一以上的數(shù)先從后向前數(shù)，每三位數(shù)加一“,”（千分位）；第一個(gè)（千分位）；第一個(gè)“,”號(hào)前為號(hào)前為thousand; 第第二個(gè)二個(gè)“,”號(hào)前為號(hào)前為million; 第三個(gè)第三個(gè)“,”號(hào)前為號(hào)前為billion。如：如：1,001 4,000 9,743 174,301750,000,000 one thousand and onefour thousandnine thousand, seven hundred and forty-threea (one) hundred and seventy-four thousand, three hundred and oneseven hundred and fifty million2. 序數(shù)詞的讀法序數(shù)詞的讀法序數(shù)詞一般以與之相應(yīng)的基數(shù)詞加詞尾序數(shù)詞一般以與之相應(yīng)的基數(shù)詞加詞尾-th構(gòu)成，如：構(gòu)成，如：tenth（第十）。但下面這些基（第十）。但下面這些基數(shù)詞在變序數(shù)詞時(shí)，數(shù)詞在變序數(shù)詞時(shí)， 有特別的地方。如：有特別的地方。如： one two three five eight nine twelvefirstsecondthirdfiftheighthninthtwelfth1/5 1/74/77/10 97/111one fifthone seventhfour seventhsseven tenths ninety-seven one hundred and elevenths 3. 分?jǐn)?shù)的讀法分?jǐn)?shù)的讀法分子用基數(shù)詞分子用基數(shù)詞,分母用序數(shù)詞分母用序數(shù)詞;分子大于分子大于1時(shí)時(shí), 分母的序數(shù)詞后需要加分母的序數(shù)詞后需要加s。4. 小數(shù)的讀法小數(shù)的讀法小數(shù)點(diǎn)讀作小數(shù)點(diǎn)讀作 point0.50.761.2323.45point fivepoint seven sixone point two threetwenty-three point four five5. 百分?jǐn)?shù)的讀法百分?jǐn)?shù)的讀法27% 45% 86% twenty-seven percent forty-five percent eighty-six percent1,000 2,000 12,000 112,000796,000one thousandtwo thousandtwelve 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 hundred 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 million.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.