Module5ALessoninaLab词海拾贝难句剖析理解诱思Lifeisfullofsurprisingchanges.Herearetwochangesforyoutoexplore.ChemicalChangeandPhysicalChangeTherearetwokindsofchangesinourdailylife—thechemicalchangeandthephysicalchange.Inachemicalchange,thereisalwaysanewsubstanceformed.Breakingupwaterintohydrogen1andoxygenisachemicalchange.Ineachofthechemicalchangeatleastonenewsubstanceisformed.Achangeisnotachemicalchangeifitdoesn’tformanewsubstance.词海拾贝难句剖析理解诱思Physicalchangesareverycommon,too.Therearemanyexamples.Youcanmakeaphysicalchangebytearing2apieceofpaperintotwo,orbycuttingapieceofironwithalathe3.Herethepaperisstillpaper,andtheironisstilliron.Anotherwayofmakingaphysicalchangeisdissolvingsomethinginwater.Whenyoudissolvesaltinwater,thesaltdisappears.Youmaythinkthatanewsubstancehasbeenformed.Butinfactthereisnonewsubstance.Thesaltisstillsalt.Youcanstilltasteit.Sothedissolvingofsomethingisusuallyaphysicalchange.词海拾贝难句剖析理解诱思Whenwaterfreezes,thechangeisalsoaphysicalone.Thewaterchangesfromliquidtosolid.Butitisstillthesamesubstance.Thatiswhythefreezingofanythingisaphysicalchange.Andpeopleoftentellthedifferencesbetweenachemicalchangeandaphysicalchangethroughsomeexperiments.Inthismodule,let’sexplore4themagicalscienceworldbydoingexperimentsbyourselves.词海拾贝难句剖析理解诱思译文:化学变化和物理变化日常生活中存在两种变化,它们是化学变化和物理变化。词海拾贝难句剖析理解诱思在化学变化中总是有新的物质生成。把水分解成氢气和氧气是一种化学变化。在每一次的化学变化中至少有一种新的物质生成。没有新的物质生成的变化不是化学变化。物理变化也很常见。有很多例子(可以说明这个问题)。你可以通过把一张纸撕成两部分或用机床切割铁块来产生物理变化。在这个变化中纸仍然是纸,铁块仍然是铁块。另一种产生物理变化的方法是在水中溶解某种物质。当你把盐溶解在水中时,盐不见了。你或许会认为有一种新的物质生成了。但事实上并没有新物质生成。盐还是盐。你仍然能够尝到它。所以溶解通常属于物理变化。词海拾贝难句剖析理解诱思当水结冰时,这种变化也是物理变化。只不过水从液态变成了固态,但它仍然是同一种物质。那就是为什么所有的凝固都是物理变化。人们常常通过实验来区分化学变化和物理变化。在本模块中,让我们通过自己做实验来探索神奇的科学世界吧。词海拾贝难句剖析理解诱思1.substance[̍sʌbstəʌs]n.物质,东西2.hydrogen[̍haIdrədʒən]n.氢气3.lathe[leIð]n.车床4.explore[Ik̍splɔː]v.探测,探索词海拾贝难句剖析理解诱思Youcanmakeaphysicalchangebytearingapieceofpaperintotwo,orbycuttingapieceofironwithalather.译文:你可以通过把一张纸撕成两部分或用机床切割铁块来产生物理变化。剖析:本句是简单句,其中bydoing是固定搭配,“通过……的方式”。词海拾贝难句剖析理解诱思1.Whichofthestatementsistrue?A.Inaphysicalchange,thereisoftenanewthingformed.B.Onlyonenewsubstanceisformedinachemicalchange.C.Thepassageisdevelopedbygivingexamples.D.Onlybydoingexperimentscanwetellaphysicalchangefromachemicalchange.2.Canyougiveanexampletoshowthedifferencesbetweenaphysicalchangeandachemicalchange?答案:C答案:Theanswervaries.SectionⅠIntroduction,ReadingandVocabulary一二三四Pre-reading一、写作词汇语境考查,预习Introduction,ReadingandVocabulary部分的词汇,完成下列对话或语段。1.—What’syour(目标)oflife?—Tochangetheworldbyinventingthings.2.—Howdidthey(反应)tothenewrule?—Theywerestronglyagainstit.3.—What(结论)canwereachfromtheexperiment?—Itdoesn’tmeltwithoutwater.aimreactconclusion一二三四4.—Youlooktired.You’dbetter(均衡)yourtimebetweenworkandrelaxation.5.—Whatdoesyourheadte...
