Unit3Protectingourselves课外阅读练习阅读下列短文，从每篇短文后所给各题的四个选项中，选出最佳选项。RecentlytheWorldHealthOrganizationannouncedthatthediseaseofsmallpox（天花）hadalmostbeenwipedoutinmostpartsoftheworld,thankstowidespreadvaccination（种牛痘）．Mostpeoplearevaccinatedatleastonceintheirlivesandiftheywishtotravelfromonecountrytoanothertheymustbeabletoprovethattheyhavehadarecentvaccination．Inthiswaythediseasehasbeenpreventedfromspreadingandtodayoneseldomhearsofitatall．Thisismainlybecauseofthegreatdiscoverymadebyavillagedoctor,EdwardJenner,inabout1798whenhepublishedhisreportofhisnewexperimentcalledvaccination（fromtheword“vacca”meaningacow）．Jennerdiscoveredthatpeoplewhoworkedwithcattleoftensufferedfromaharmlessdiseasewhichtheycaughtfromthecattle,butthesepeopleneverseemedtogetsmallpox．Soheexperimentedbyputtingthediseaseintoasmallopeningonthearmsofhealthypeople,andthoughtheirarmsbecamepainfulforadayortwo,theysoonrecoveredandnoneofthesepeopleevergotsmallpox．Sothenewsofthewonderfuldiscoveryspreadtoothercountriesandpeoplerushedtotheirdoctorstobevaccinated．Inmanycountriesthesimplewaytodealwiththearmwasdoneonthousandsofpeople,andtheterriblesmallpoxbegantodisappear．1．Whichofthefollowingisanineffectualwayofpreventingthespreadofsmallpox？A．Peoplegoingabroadshouldpromisenottospreadthedisease．B．Mostpeoplewerevaccinatedagainstthediseaseatleastonce．C．Peopletravellingfromonecountrytoanothermustprovetheyarevaccinated．D．Peoplemustbevaccinatedshortlybeforegoingtoforeigncountries．2．Thedoctor'snewdiscoverywascalled“vaccination”forthereasonthat____．A．hediscoveredsmallpoxnearafarmB．hewasworkingwithcattleinthecountrysideC．heexperimentedwithadiseasefromthecattleD．peoplegotthediseaseofsmallpoxfromthecattle3．Thenewsofthediscovery____．A．spreadfarandnearinthewesterncountriesB．madepeoplerushtoDrJennerforvaccinationC．helpedtogetridoftheterriblediseaseofsmallpoxD．caughtpeople'sattentionfromallcornersoftheworld答案：ACD
