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1、Unit7ScienceandtechnologyTextAFourgreatinventionsTextBPharmacologySupplementaryReadingMathematics学习任务整体上掌握TextA和TextB两篇文章的内容，包括背景资料，单词，相关专有名词等。完成TextA和TextB的课后题目。浏览TextC。2021/8/21TextAFourgreatinventions导读： 四大发明是指中国古代对世界具有很大影响的四种发明。即造纸术、指南针、火药、印刷术。四大发明对中国古代的政治、经济、文化的发展产生了巨大的推动作用。而且对世界文明发展史也
2、产生了非常大的影响。TextAFourgreatinventionsPapermaking,gunpowder,printingandthecompassarefourancientinventionsbyChinesepeoplethathavehadahugeimpactontheentireworld.TextAFourgreatinventions-----PaperMakingIn105A.D.CaiLun,aeunuchduringtheEasternHanDynasty,inventedpaperfromwornfishnet,barkandcloth.Text
3、AFourgreatinventions-----PaperMakingThetechniqueofpapermakingwasexportedtoKoreain384A.D.AKoreanMonkthentookthisskillwithhimtoJapanin610A.D.DuringawarbetweentheTangDynastyandtheArabEmpire,theArabscapturedsomeTangsoldiersandpapermakingworkers.Thus,apaperfactorywassetupbytheArabs.Inthe11thCent
4、urytheskillwascarriedtoIndiawhenChinesemonksjourneyedthereinsearchofBuddhistsutras.ThroughtheArabs,AfricansandEuropeansthenmasteredtheskill.ThefirstpaperfactoryinEuropewassetupinSpain.Inthelatterhalfofthe16thcentury,thisskillwasbroughttoAmerica.Bythe19thcentury,whenpaperfactoriesweresetupin
5、Australia,papermakinghadspreadtothewholeworld.TextAFourgreatinventions-----PaperMakingTextAFourgreatinventions-----GunpowderItwasfirstinventedinadvertentlybyalchemistswhileattemptingtomakeanelixirofimmorality.Itwasamixtureofsulphur,saltpeter,andcharcoal.TextAFourgreatinventions-----Gunpowde
6、rItwasamixtureofsulphur,saltpeter,andcharcoal.AttheendoftheTangDynasty,gunpowderwasbeingusedinmilitaryaffairs.DuringtheSongandYuanDynasties,frequentwarsspurredthedevelopmentofcannons,andfire-arrowsshotfrombambootubes.Inthe12thand13thcenturies,gunpowderspreadtotheArabcountries,thenGreece,oth
7、erEuropeancountries,andfinallyallovertheworld.2021/8/21TextAFourgreatinventions-----GunpowderTextAFourgreatinventions-----PrintingTechniqueBiShenginventedmoveable,reusableclaytypeafternumeroustests.Singletypesweremadeandpickedoutforprintingcertainbooks.T
