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1、Unit1Greenpharmacy-herbalmedicine1)Plantkingdomoncewasmerepharmacyofthehumanrace,butnowwhenyougetintothemodernpharmacy,plant-deriveddrugshavebeenhardlyfound.2)Althoughtodaythenumberofplant-baseddrugshasbeendecreased,theeffectivechemicalsinmanytables,capsuleandbot
2、tle-containeddrugsareoriginatedfromplantkingdom.3)Amongchemicalsubstancescontainedinplants,somemustbetoxic,butsomemustbedrugsavailabletous.4)Duringthemillionsofyearssincemancametotheearth,hehasbeendoingexperimentsonavarietyofplantsabouthim.5)Thereexistmistrust,su
3、spicionandhostilitybetweentheorthodoxmedicineandherbalpractitionersformanyyears,whicharethreateningthepossibilityofestablishinggoodworkingrelationship.6)Whenwethinkoftheeffectivenessofquinine,thegreatcontributionsmadebyherbalmedicinetomedicalsciencearequiteeviden
4、t.7)However,inthepastfewdecades,thenumberofnewly-introduceddrugshasobviouslydecreased.8)Themedicallegacyofourmotherlandisaninexhaustiblenew-drugtreasure,whichremainsustotapwithnewmethods.9)Ifpharmacologicalmethodhadnotbeenintroducedtothestudyofvincarosea,thedisco
5、veryofvincaleukoblastinewouldhavebeenpostponedbymanyyears.10)Westernmedicinehardlybelievesthatsomeonewhoknowsnothingofadiseasemechanismcouldbecapableofcuringit.Unit2Howdoeshumanbodyfightdisease?Peopletendtobelievethatantibioticswereinventedbyhumanbeing,butinfact,
6、theyarepurelynaturalproducts.SinceAlexanderFleming,aBritishbiologistdiscoveredanti-microbialsubstancereleasedbythePenicilliumfungiin1928,ithasbeenlearnedthatthissubstancecanproducepowerfulantibioticeffect.Infact,antibiotics,areexactlymanufacturedbyorganisms,namel
7、y,bacteriaandfungi,whichpeopleaimtodestroy.AfterFleming’sdiscoveryofpenicillin,SelmaWalksmanin1943isolatedStreptomycinfromasoilbacterium,Streptomycusgriseus.Scientistshavenotmadeitclearcompletelywhyorganismscanproduceantibiotics.Thisquestionhasbecomethetopicfordi
8、scussion.Whyantibioticsareusefulinmedicineisthattheycannotonlykillmicrobes,butalsonotkillthebodycellsastheydotothemicrobes,bodycellsareentirelydifferentfromtho
