1、Module 5A Lesson in a LabIntroductionand vocabularydoing an experimentapparatus(es),preitscrucibletongs balanceBunsen burnertest tubetest tubeMore Words in Module 5solid slid 固体liquid likwid 液体gas gs 气体expand ikspnd 扩张contract kntrkt 收缩mixture mikst 混合物substance sbstns 物质oxygen ksidn 氧气dissolvedi zl
2、v溶解，分解1.(a)Water exists as a solid,a liquid and a gas.(b)Water exists as a solid and a liquid only.2.(a)When you heat a metal,it expands.(b)When you heat a metal,it contracts.Guess and check the answer.3.(a)Steel is a mixture of iron and other substances.(b)Steel is a mixture of iron and oxygen.4.(a
3、)Two-thirds of the earths surface is water.(b)50%of the earths surface is water.5.(a)The distance of the sun from the earth is 25,500 kilometers.(b)The distance of the sun from the earth is 150,500,500 kilometers.6.(a)The earth is 4.6 million years old.(b)The earth is 4.6 billion years old.7.(a)The
4、earth is twice as large as the moon.(b)The earth is forty-nine times larger than the moon.Put the words in pairs or groups.Put the words in pairs or groups.air gas-oxygencontract-expandearth sun-moongas liquid-solidcontract air earth gas liquid oxygen moon solid sun expandelectricity iron metal stee
5、l air glass Answer these questions.1.Which of the above are natural?2.Which are man-made?3.Which can be both?Electricity,iron,some metals,air.Steel,some metals and glass.Electricity and some metals.基数词(cardinal number)序数词(ordinal number)分数(fraction)小数(decimal)百分数(percentage)的读法1.基数词(cardinal number)
6、的读法A.“十位”+连字符+“个位”，。e.g.23 89B.“百位”加and,再加末两位。e.g.223 416 809 twenty-threeeighty-ninetwo hundred and twenty-threefour hundred and sixteeneight hundred and nineC.千位以上，100 250 350 555。e.g.1,001 9,743 750,000,000 billion,million,thousand,hundred，-ty,teen.Noyi and wan in English,one thousand and onenine
7、 thousand,seven hundred and forty-threeseven hundred and fiftymillion2.序数词(ordinal number)的读法序数词一般以与之相应的基数词加-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。A.one two three five eight nine twelvefirstsecondthirdfiftheighthninthtwelfthB.以-ty结尾的词，先变-y为-ie，再加-th。e.g.twenty fortyC.多位基数词，变词尾。e.g.twenty-one twenty
8、-two ninety-nine a hundred and fifty-three twentiethfortiethtwenty-firsttwenty-secondninety-ninth a hundred and fifty-third子基，母序，分子大于1，分母用复数。e.g.1/4 2/3 7/9 5/12 one-fourthtwo-thirdsseven-ninthsfive-twelfths3.分数词(fraction)的读法特殊的表达法 a/one halfa/one quarterthree quarters4.小数(decimal desiml)的读法7.8 0.12
9、5 14.397 seven point eightzero point one two fivefourteen point three nine seven5.百分数(percentage)的读法27%45%86%twenty-seven percent forty-five percent eighty-six percentSay them again,first as decimals,then as percentageVocabulary on Page 46Activity 1Say these numbers as decimals2 2 3012Two point five
10、 Two point fiveTwo point two fivepoint seven fivethirty point fivetwelve point fiveRead these questions aloud and say the answers.1.What is 1/2 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 thousandfifty million4.How muc
11、h 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 1.Finish Exercises in the workbook.2.Work in pairs.Give your partner five sums.Use numbers over a million.
