1、Introduction-3.Quiz time.(4m)Introduction-3.Quiz time.(4m)Choose the correct answers to Choose the correct answers to the quiz in Part 1.Then listen and check your answers.the quiz in Part 1.Then listen and check your answers.1.Water Water exists asexists as a solid,a liquid and a gas.a solid,a liqu
2、id and a gas.2.When you heat a metal,it When you heat a metal,it expandexpands.s.3.Steel is Steel is a mixture ofa mixture of iron and other iron and other substancesubstances.s.4.Two-thirds ofTwo-thirds of the earths surface the earths surface isis water.water.5.The The distancedistance of the sun
3、from the earth is of the sun from the earth is 150,500,500 kilometres.150,500,500 kilometres.6.The earth is 4.6 billion years old.The earth is 4.6 billion years old.7.The earth is forty-nineThe earth is forty-nine times larger than times larger than the moon.the moon.Answers:Answers:Introduction 4.C
4、lassification(2m)Introduction 4.Classification(2m)Put the words in Put the words in pairs or groups.pairs or groups.contract air earthcontract air earth gas liquid oxygen gas liquid oxygenmoon solid moon solid expand sunmoon solid moon solid expand sun11223344air gas-oxygenair gas-oxygencontract-exp
5、andcontract-expandearth sun-moonearth sun-moongas liquid-solidgas liquid-solidIntroduction 5.Classification(2m)Introduction 5.Classification(2m)Put words in the Put words in the right place.right place.electricityelectricity iron iron metal metal steel steel air air glassglassnaturalnaturalman-madem
6、an-madebothbothelectricity iron air electricity iron air some metalssome metalssteel glass some metalssteel glass some metalselectricity electricity some metals(alloy for example)some metals(alloy for example)Look at the pictures collected by our classmates.Do you know the name of these equipment？te
7、st tube tongs balancecrucible beaker&glass rod Bunsen burner Since you are interested in doing scientific experiments,now lets get to know some vocabulary and knowledge related to science and experiment.Potassium（钾）Sodium(钠)Calcium(钙)Magnesium(镁)Aluminium（铝）Zinc（锌）Iron（铁）Copper（铜）英语中基数词、序数词、分数、小数和百分
8、数的读法1.基数词的读法：A.先说“几十”，再说“几”，中间用连字符。如：23 89B.先说“几百”，再加and,再加末两位数（或末位数）。如：223 416 809 twenty-threeeighty-ninetwo hundred and twenty-threefour hundred and sixteeneight hundred and nineC.1000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,
9、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：A.one two three five eight nine twelvefirstsecondthirdfifthei
10、ghthninthtwelfthfractionWe write1/5 1/61/74/7We sayone fifthone sixthone seventhfour sevenths7/10 97/111seven tenths ninety-seven one hundred and elevenths 45/87forty-five eighty-sevenths总结:你能看出他们有什么特点吗？分子用基数词,分母用序数词;分子大于1,分母的序数词需要加s。另外,还有几个特殊表达的情况:1/21/4 1/3 3/42/3A half is the same as 50 percent.o
11、ne halfone quarter one third 33.33r%r:recurringthree quarters two thirds 66.66%50%25%75%百分数：percentage5)百分数的读法27%45%86%twenty-seven percentforty-five percenteighty-six percentCan you say the following in English correctly?1,000 2,000 12,000 112,000796,000one thousandtwo thousandtwelve thousandone hu
12、ndred and twelve thousandseven hundred and ninety six thousand879,457eight hundred and seventy-nine thousand,four hundred and fifty-seven1,000,000 9,000,00032,000,000 212,000,000one million nine millionthirty-two milliontwo hundred and twelve million988,766,688nine hundred and eighty-eight million,s
13、even 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-one1,000,000,000one billion9,000,000,000nine billion32,000,000,000thirty-two billion564,865,000,000five hundred,sixty-four bil
14、lion,eight hundred,sixty-five million978,876,675,467nine hundred and seventy-eight billion,eight hundred and seventy-six million,six hundred and seventy-five thousand,four hundred and sixty-sevenPracticeNow lets say:2/5 5/8 9/10 3/8 5/6two-fifthsfive-eighthsnine-tenths three-eighthsfive-sixthsCan yo
15、u say the following in English Can you say the following in English correctly?correctly?0.50.80.761.23point fivepoint eight point seven sixone point two three23.45100.3287.6757.564twenty-three point four fiveone hundred point three two eighty-seven point six seven fiveseven point five six fourpointp
16、ointpointpoint总结：小数点用pointRead 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 millionforty-eight million,forty-six thousandfifty million4.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 thousand6.What is 10%of 800,000,000?eighty million HomeworkFinish Exercise 9 on P 93.
