最新英语考试阅读理解辅导试题及答案最新英语考试阅读理解辅导试题及答案现在很多学生在幼儿园就接触过双语教学模式，英语的重要性可想而知。或许英语已不再单单是一门学科，它已经成为必须掌握的一种语言。以下是小编为大家搜索整理的英语阅读训练，希望能给大家带来帮助!更多精彩内容请及时关注我们应届毕业生考试网!HenryIIIdidn'tknowmuchaboutbiology.Hewentthroughsixwivesbackinthe1500s,lookingforonewhocouldbearhimason.Scientistsnowknowthatit'sthefather'ssperm,notthemother'segg,whichdetermineswhetherababyisaboyoragirl.AndlastweekresearchersattheGeneticsandIVFInstitute,aprivatefertility(生育能力)centerinVirginia,announcedanewtechniquethatwillallowparentstochoosethesexoftheirbaby-to-be,beforeithasevenbeenconceived.ThescientistusedatinylaserdetectortomeasuretheDNAinmillionsofspermcellsastheypasssinglefilethroughanarrowtube,likecattlebeingherdedthroughacorral(牲口栏).Inastudypublishedlastweek,"girlsperm,"whichhasmoreDNA—thegeneticmaterial—ineachcell,wascollected,while"boysperm"wasdiscarded.Andwhenpurifiedgirlspermwasusedtoimpregnate(使受孕)agroupofmothers,15of17resultingbabiesturnedouttobegirls.Theresearcherssaythat"sexselection"canalsodoubleamother'schanceofhavingasonandcanbeusedtoavoidgeneticdiseasesthataffectonlyonegender,suchashemophilia(血友病).Butsomeexperts,likeNewYorkUniversityfertilityspecialistDr.JamieGrifo,worrythatsexselectioncouldleadtoakindofinuteri(子宫)discrimination,especiallyincultureswheresonsareconsideredsuperiortodaughters."It'svaluingonegender'overanother,"Grifosays."Idon'tthinkthat'ssomethingweshouldbedoing."Sofar,patientsattheinstitutehavebeenaskingforbothboysandgirls,inorderto"balance"theirfamilies.Andsomeethicsexpertssaythat'sfine,aslongasparentsarejustlookingforalittlegendervariety."Ifyouhavethreeboys,andyouwantagirl,"saysUniversityofTexasreproductive-lawprofessorJohnRobertson,"that'snotgenderbiasatall."练习题：Choosecorrectanswerstothequestion:1.TheDNAinthespermcellscanbemeasured______.A.inthesamewayhowthecattleareherdedB.whentheypassthroughatubeonebehindtheotherC.aftertheypassthroughalasertubeD.whenthey