Module 5《A Lesson in a Lab》introduction課件1（30張PPT）（外研版必修1）

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Module 5 A lesson in a lab,Introduction,Introduction - 3.Quiz time.(4m) Choose the correct answers to the quiz in Part 1. Then listen and check your answers.,,Water exists as a solid, a liquid and a gas. When you heat a metal, it expands. Steel is a mixture of iron and other substances. Two-thirds of the earth’s surface is water. The distance of the sun from the earth is 150,500,500 kilometres. The earth is 4.6 billion years old. The earth is forty-nine times larger than the moon.,Answers:,,Introduction – 4.Classification(2m) Put the words in pairs or groups.,contract air earth gas liquid oxygen moon solid moon solid expand sun,,air – gas - oxygen,contract - expand,earth – sun - moon,gas – liquid - solid,Introduction – 5.Classification(2m) Put words in the right place.,electricity iron metal steel air glass,electricity iron air some metals,steel glass some metals,electricity some metals (alloy for example),Look at the pictures collected by our classmates. Do you know the name of these equipment？,test tube tongs balance,crucible beaker & glass rod Bunsen burner,Since you are interested in doing scientific experiments, now let’s get to know some vocabulary and knowledge related to science and experiment.,,Potassium （鉀）,Sodium(鈉),Calcium(鈣),Magnesium(鎂),Aluminium （鋁）,Zinc （鋅）,Iron （鐵）,Copper （銅）,Vocabulary,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,1.基數(shù)詞的讀法：,A. 先說“幾十”， 再說“幾”，中間用連字符。如： 23— 89—,B. 先說“幾百”， 再加and,再加末兩位數(shù)（或末位數(shù)）。如： 223— 416— 809—,twenty-three,eighty-nine,two hundred and twenty-three,four hundred and sixteen,eight hundred and nine,C. 1000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“,”號前為thousand; 第二個“,”號前為million; 第三個“,”號前為billion。如： 1,001— 4,000— 9,743— 174,301— 750,000,000—,one thousand and one,four thousand,nine thousand, seven hundred and forty-three,a (one) hundred and seventy-four thousand, three hundred and one,seven hundred and fifty million,2.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-th構(gòu)成，如：tenth（第十），但下面這些基數(shù)詞在變序數(shù)詞時， 有特別的地方。如：,A. one — two — three— five— eight — nine— twelve—,first,second,third,fifth,eighth,ninth,twelfth,fraction,We write,1/5 1/6 1/7 4/7,We say,one fifth one sixth one seventh four sevenths,7/10 97/111,seven tenths,ninety-seven one hundred and elevenths,45/87,forty-five eighty-sevenths,總結(jié): 你能看出他們有什么特點(diǎn)嗎？,分子用基數(shù)詞,分母用序數(shù)詞;分子大于1,分母的序數(shù)詞需要加s。,另外, 還有幾個特殊表達(dá)的情況: 1/2 1/4 1/3 3/4 2/3 A half is the same as 50 percent.,one half one quarter one third 33.33r % r:recurring three quarters two thirds 66.66%,50%,25%,75%,百分?jǐn)?shù)： percentage,5) 百分?jǐn)?shù)的讀法 27% — 45% — 86% —,twenty-seven percent,forty-five percent,eighty-six percent,Can you say the following in English correctly?,1,000 2,000 12,000 112,000 796,000,one thousand,two thousand,twelve thousand,one hundred and twelve thousand,seven hundred and ninety six thousand,879,457,eight hundred and seventy-nine thousand, four hundred and fifty-seven,1,000,000 9,000,000 32,000,000 212,000,000,one million,nine million,thirty-two million,two hundred and twelve million,988,766,688,nine hundred and eighty-eight million, seven hundred and sixty-six thousand, six hundred and eighty-eight,987,654,321,nine hundred and eighty-seven million, six hundred and fifty-four thousand, three hundred and twenty-one,1,000,000,000,one billion,9,000,000,000,nine billion,32,000,000,000,thirty-two billion,564,865,000,000,five hundred, sixty-four billion, eight hundred, sixty-five million,978,876,675,467,nine hundred and seventy-eight billion, eight hundred and seventy-six million, six hundred and seventy-five thousand, four hundred and sixty-seven,Practice,Now let’s say: 2/5 5/8 9/10 3/8 5/6,two-fifths,five-eighths,nine-tenths,three-eighths,five-sixths,Can you say the following in English correctly?,0.5 0.8 0.76 1.23,point five point eight point seven six one point two three,,23.45 100.32 87.675 7.564,twenty-three point four five,one hundred point three two,eighty-seven point six seven five,seven point five six four,point,point,point,point,總結(jié)：小數(shù)點(diǎn)用point,Read these questions aloud and say the answers.,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,Homework,Finish Exercise 9 on P 93.,See you!,同學(xué)們,來學(xué)校和回家的路上要注意安全,同學(xué)們,來學(xué)校和回家的路上要注意安全,同學(xué)們,來學(xué)校和回家的路上要注意安全,同學(xué)們,來學(xué)校和回家的路上要注意安全,