考研英语模拟试题二及答案解析word版.docx

考研英语模拟试题二及答案解析word版

考研英语模拟试题二及答案解析（word版）在社会的各个领域，我们总免不了要接触或使用试题，借助试题可以对一个人进行全方位的考核。那么一般好的试题都具备什么特点呢？以下是小编为大家收集的考研英语模拟试题二及答案解析（word版），仅供参考，大家一起来看看吧。考研英语模拟试题二及答案解析word版篇1Text4Whenadiseaseofepidemicproportionsripsintothepopulace，scientistsimmediatelygettowork，tryingtolocatethesourceoftheafflictionandfindwaystocombatit.Oftentimes，successisachieved，asmedicalscienceisabletoisolatetheparasite，germorcellthatcausestheproblemandfindswaystoeffectivelykillorcontainit.Inthemostseriousofcases，inwhichtheentirepopulationofaregionorcountrymaybeatgraverisk，itisdeemednecessarytoprotecttheentirepopulationthroughvaccination，soastosafeguardlivesandensurethatthediseasewillnotspread.Theprocessofvaccinationallowsthepatientsbodytodevelopimmunitytothevirusordiseasesothat，ifitisencountered，onecanwarditoffnaturally.Toaccomplishthis，asmallweakordeadstrainofthediseaseisactuallyinjectedintothepatientinacontrolledenvironment，sothathisbodysimmunesystemcanlearntofighttheinvaderproperly.Informationonhowtopenetratethediseasesdefensesistransmittedtoallelementsofthepatientsimmunesysteminaprocessthatoccursnaturally，inwhichgeneticinformationispassedfromcelltocell.Thismakessurethat，shouldthepatientlatercomeintocontactwiththerealproblem，hisbodyiswellequippedandtrainedtodealwithit，havingalreadydonesobefore.Therearedangersinherentintheprocess，however.Onoccasion，eventheweakenedversionofthediseasecontainedinthevaccineprovestoomuchforthebodytohandle，resultingintheimmunesystemsuccumbing，and，therefore，thepatientsdeath.Suchisthecaseofthesmallpoxvaccine，designedtoeradicatethesmallpoxepidemicthatnearlywipedouttheentireNativeAmericanpopulationandkilledmassivenumbersofsettlers.Approximately1in10，000peoplewhoreceivesthevaccinecontractthesmallpoxdiseasefromthevaccineitselfanddiesfromit.Thus，iftheentirepopulationoftheUnitedStatesweretoreceivetheSmallpoxVaccinetoday，3000Americanswouldbeleftdead.Fortunately，thesmallpoxviruswasconsiderederadicatedintheearly1970s，endingthemandatoryvaccinationofallbabiesinAmerica.Intheeventof