中学生百科英语2

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1、中学生百科英语2:Thoughts&Notions01TheZipper02ThePostageStamp03PencilsandPens04TheUmbrella05TheMetricSystem06ThaiBoxing07SumoWrestling08TarahumaraFootRaces09OlympicSports10Greatathletes11ThePufferFish12FoodsfromAroundtheWorld13Chocolate14TheBlueRevolution15Twenty-OneDaysWithoutFood16TheMarieC

2、eleste17TheRoanokeSettlement18TheEasterIslandStatues19TheTunguskaFireball20MysteryoftheMonarchs21TheHistoryofMoney22MassMarketing23Inflation24DoingBusinessAroundtheWorld25CreditCards1TheZipperThezipperisawonderfulinvention.Howdidpeopleeverlivewithoutzippers?Theyareverycommon,soweforge

3、tthattheyarewonderful.Theyareverystrong,buttheyopenandcloseveryeasily.Theycomeinmanycolorsandsizes.Inthe1890s,peopleintheUnitedStatesworehighshoeswithalongrowofbuttons.Clothesoftenhadrowsofbuttons,too.Peoplewishedthatclotheswereeasiertoputonandtakeoff.WhitcombL.Judson,anengineerfromth

4、eUnitedStates,inventedthezipperin1893.However,hiszippersdidn'tstayclosedverywell.Thiswasembarrassing,andpeopledidn'tbuymanyofthem.ThenDr.GideonSundbackfromSwedensolvedthisproblem.Hiszipperstayedclosed.Azipperhasthreeparts:1.Therearedozensofmetalorplastichooks(calledteeth)intworows.2.T

5、hesehooksarefastenedtotwostripsofcloth.Theclothstripsareflexible.Theybendeasily.3.Afastenerslidesalongandjoinsthehookstogether.Whenitslidestheotherway,ittakesthehooksapart.Dr.Sundbackputthehooksonstripsofcloth.Theclothholdsallthehooksinplace.Theydon'tcomeapartveryeasily.Thissolvedthep

6、roblemofthefirstzippers.(212words)2ThePostageStampBeforetheinventionofthepostagestamp,itwasdifficulttosendalettertoanothercountry.Thesenderpaidforthelettertotravelinhisorherowncountry.Thenthepersonintheothercountrypaidfortherestofthetrip.Ifalettercrossedseveralcountries,theproblemwasw

7、orse.RowlandHill,aBritishteacher,hadtheideaofapostagestampwithglueontheback.TheBritishpostofficemadethefirststampsin1840.TheywerethePennyBlackandtheTwopenceBlue.Apersonboughtastampandputitonaletter.Thepostofficedeliveredtheletter.Whenpeoplereceivedletters,theydidn'thavetopayanything.T

8、hepos