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2017年职称英语考试综合C级专项练习（附答案）
题目：下面的短文后有两项测试任务：(1)第23-26题要求从所给的
6个选项中为第2-5段每段选择1个最佳标题;(2)第27-30题要求从所给
的6个选项中为每个句子确定1个最佳选项。
?TheProcessesofImmunity
?1Immunitycanbedefinedasthepowerofanindividualtoresistor
overcometheeffectsofaparticulardiseaseorsomeotherharmfulagent.
Sometimesthewordsimmunityandresistanceareusedinterchangeably;but
itismoreaccuratetothinkofimmunityasaprocesswhichcausestheeffect
oftheinvadingbacteriatobeunabletoworkbeforetheyhavehadachance
tosetupaninfection.
?2Thechemicalprocessesthatproduceimmunitycanbedescribed
brieflyasfollows.Everydisease-producingbacteriumthatentersthebody
carrieswithinitselfasubstance.
?3Theseantibodiesdestroythepoisonoussubstanceofthedisease-
producingbacteria,orelseactontheminawaythatwillmakethebacteria
moresensitivetotheactionofthewhitebloodcellsorotherphagocytes.
Antigensvaryintheirchemicalstructureandspecificantigenwillstimulate
thebodytoproduceonlyaspecificantibodyinresponsetoit.
?4Theantibody,then,willreactonlywiththekindofantigenthat
causeditsproductionandnoother.Thisisthereasonfortheselectivenature
ofimmunitysothatimmunitytoonediseasedoesnotnecessarilycausea
persontobeimmunetoanother.Indeed,itispossibletohaveimmunityto
onediseaseandsensitivity,itsopposite,toadifferentdisease.Soitisuseful
toconsiderimmunityasaselectiveprocess.Thisselectivecharacteristichas
aname;specificity.
?5Therearetwomaingroupsofimmunity:inheritedimmunityand
acquiredimmunity.Thissecondtypemaybeacquiredbynaturalorartificial
means.Inaddition,anacquiredimmunitymaybeeitheractiveorpassive.
?23.Paragraph2________.
?24.Paragraph3________.
?25.Paragraph4________.
?26.Paragraph5________.
?A.TheDefinitionofImmunity
?B.TheProcessofAntibodies
?C.TheFunctionsof
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