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1、Unit2GrammarandusageTheelementsofaparagraphTopicsentenceSupportingsentencesConcludingsentence1.主题句(Topicsentence)每一个段落都应有一个要点，该要点通常由主题句表达。主题句应清楚地陈述本段落的信息。主题句通常是段落的第一句。然而，并不是所有的段落都有主题句。例如有时一个段落延续了前一段落的主题，而前一段落已有主题句了。2.支撑句(Supportingsentences)主题句后应跟有对其加以
2、解释或证明的支撑句。段落中支撑句的排列顺序应该是有逻辑的。我们可以使用过渡词语将每个句子与前后的句子连接。可使用的过渡词语包括：forexample,forinstance,furthermore,first,ontheotherhand,however,but和also等。3.结论句(Concludingsentence)段落应以一句用新方式来重复主题的句子结尾。我们也可以用结束句来表达关于这个主题的最后想法，或用它来帮助引入下一段的主题。Lookattheseparagraphs.Chooset
3、hebesttopicsentencetoaddtoeachparagraph.________Atfirst,leavesonthetreesturnyellowandred.Oneday,theyturnbrownandfalltotheground.Nightfallsabitearliereachday.Then,onemorning,everythingiscoveredbyasoftblanketofsnow.Whenpeoplegooutside,theirhandsfeelcolda
4、ndnumb.Winterhascome!A.Autumnpassestooquickly.B.Autumnleavesarebeautiful.A________Ifonewishestobecomeascientist,suchasaphysicist,biologistorchemicalengineer,heorshemaystudyphysics,botany,biochemistryandmathematics.However,ifastudentpaysattentiononlytot
5、hesesubjects,heorshewilldevelopanalyticalskillsbutnotcreativeskills.Manyjobsrequirecreativeskills,andartsstudentshavemorecreativeskillsthanthosewhofocusonscience.Tome,thisisevidenceoftheimportanceofteachingtheartsinourschools.A.Schoolsshouldteachmathsa
6、ndscience.B.Artseducationisanecessarypartofschool.B__________.Animalsandhumanbeingssharethisworldandeverythinginit.Unfortunately,manypeopleareunawareofthis,anddonottreatanimalswell.Somepeoplehurtanimalsdirectly,orkillthemtoselltheirfur.Othersmayhurtani
7、malsmoreindirectly,doingthingslikecuttingdowntreesanddamagingtheenvironmentwhereanimalslive.However,thesearenottheonlypeoplewhohurtanimals.Whetherintentional存心的ornot,allofushaveahandindoingso,forbynotstoppingothershurtinganimals,weareguiltyofhurtingthe
8、maswell.Humanbeingsandanimalsshouldlivepeacefullytogether.Peopleshoulddomoretoprotectanimals.Protectinganimalsiseveryone’sduty.Humanbeingsshouldstophurtinganimals.Humanbeingsandanimalsshouldlivepeacefullytogether.Peopleshoulddomoretopro
