英语演讲PPT_Coffee_咖啡课件.ppt 21页

'Coffee1.WhatisCoffee2.Thehistoryofcoffee3.Somefamouscoffee:BluemountainMochaColombianCoffeeCappuccino4.Coffeeandhealth Coffeeisabreweddrinkpreparedfromroastedseeds,commonlycalledcoffeebeans,ofthecoffeeplant.Theyareseedsofcoffeecherriesthatgrowontreesinover70countries.Greenunroastedcoffeeisoneofthemosttradedagriculturalcommoditiesintheworld.Duetoitscaffeinecontent,coffeecanhaveastimulatingeffectinhumans.Today,coffeeisoneofthemostpopularbeveragesworldwide. Thehistoryofcoffeeisasrichasthebrewitself,datingbackmorethanathousandyears.ThefirstcoffeeplantsaresaidtohavecomefromtheHornofAfricaontheshoresoftheRedSea.Originally,coffeebeansweretakenasafoodandnotasabeverage.EastAfricantribeswouldgrindthecoffeecherriestogether,mixingtheresultsintoapastewithanimalfat.Rolledintolittleballs,themixturewassaidtogivewarriorsmuch-neededenergyforbattle. Later,aroundtheyear1000AD,Ethiopiansconcoctedatypeofwinefromcoffeeberries,fermentingthedriedbeansinwater.CoffeealsogrewnaturallyontheArabianPeninsula,anditwasthere,duringthe11thcenturythatcoffeewasfirstdevelopedintoahotdrink. BluemountainJamaicaBlueMountainCoffeeisaclassificationofcoffeegrownintheBlueMountainsofJamaica.ThebestlotsofBlueMountaincoffeearenotedfortheirmildflavourandlackofbitterness. BluemountainOverthelastseveraldecades,thiscoffeehasdevelopedareputationthathasmadeitoneofthemostexpensiveandsought-aftercoffeesintheworld;over80%ofallJamaicanBlueMountainCoffeeisexportedtoJapan. MochaCafémochaisavariantofacaffèlatte.Mochascancontaindarkormilkchocolate. MochaLikealatte,itistypicallyonethirdespresso(浓咖啡)andtwothirdssteamedmilk,butaportionofchocolateisadded,typicallyintheformofsweetcocoapowder,althoughmanyvarietiesusechocolatesyrup（糖浆）. ColombianCoffeeColombianCoffeeisaProtecteddesignationoforigingrantedbytheEuropeanUnion(September2007)thatappliestothecoffeeproducedinColombia. ColombianCoffeeTheColombiancoffeehasbeenrecognizedworldwideashavinghighqualityanddistinctivetaste.ThemainimportersofColombiancoffeeareUnitedStates,Germany,Japan,TheNetherlandsandSwitzerland. cappuccinoAcappuccinoisanItaliancoffeedrinkpreparedwithespresso,hotmilk,andsteamed-milkfoam.ThenamecappuccinocomesfromtheCapuchinfriars,possiblyreferringtothecolouroftheirhabitsortotheaspectoftheirtonsured(white)heads,surroundedbyaringofbrownhair. Acappuccinoistraditionallyservedinaporcelain（瓷质的）cup,whichhasfarbetterheat-retentioncharacteristicsthanglassorpaper.Thefoam（泡沫）ontopofthecappuccinoactsasaninsulatorandhelpsretaintheheatoftheliquid,allowingittostayhotlonger.Thefoammayoptionallyhavepowder(commonlycocoa,cinnamon（肉桂色的）ornutmeg)sprinkledontop. CoffeeandhealthWithover400billioncupsbeingslurpedupeachyear,therehavebeencountlessstudiesoncoffeeandhowiteffectsourhealth.Whatshouldwebelieve? Coffeeisnotableforitscaffeinecontent.Solet’stakealookatcaffeine.Caffeineisanalkaloid(生物碱).Alkaloidsarefoundincolanuts,coffee,tea,cacaobeans,mate(theArgentiniantea)andotherplants. Caffeineessentiallystimulatesthecentralnervoussystem,cardiacmuscle,andrespiratorysystemincreasingintellectualactivitiesandlearningability.Fortheaverage,healthyperson,however,3-4cupsofcoffee/dayisnottoomuch(ofcoursedependingonhow“charged”thosecupsare). Caffeine’seffectonpeopledifferswitheachindividual.Somepeoplearequitesensitivetocaffeineandhavetoreduceintaketoaminimumwhileothersingestitincopious（丰富的）amounts.Therehasbeenabsolutelynoconclusive（确定的）evidencetoshowthatcaffeineconsumedinmoderationisahealthriskorassociatedwithchronichealthproblems（慢性病）.Again,eachindividual’sreactiontocaffeinediffers. Thankyou~'