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7.D【解析】高速公路的开通与否不是诱导种群发生变异的因素，不会改变种群的突变频率，A错误；象群会与其他生物和环境发生协同进化，B、C错误；沿线经济作物的改变对象群而言，其作为自然因素对象群进行选择可能引起象群基因频率的定向改变，D正确8.C【解析】乙的垂体功能异常，导致分泌的促甲状腺激素减少，使得甲状腺激素减少，这属于分级调节，A正确；甲的垂体正常，由于TRH较少，对垂体的促进作用减弱，相较于甲状腺激素低下对垂体抑制减弱的效果更加明显，说明分级调节对垂体分泌的影响大于负反馈调节，B正确；注射TRH前后患者乙的TSH浓度均较低，说明垂体发生了病变，不能合成TSH,C错误；与健康人相比，患者甲、乙分泌的促甲状腺激素减少，所以甲状腺激素减少，都会表现出头晕、反应迟钝、记忆力减退等症状，甲状腺激素属于氨基酸衍生物，可以口服以缓解不适的症状，D正确。

Ages:4-8Cost:freeBrainPOPJr.MovieoftheWeekFor20years,BrainPOPhasbeenprovidingkidsallovertheworldwithin-depth,yeteasytounderstandeducationalvideosoneverythingrangingfromMozarttofoodallergies.BrainPOPJr.MovieoftheWeekisanappthathelpsyoungerkidsgetthesevideos,plusshortquizzesonthem.Ages:6-9Cost:free,optionalsubscription(is$6.99/month21.HowmuchisitifyouwanttouseEPIC!forhalfayear?A.$56B.$36C.$40D.$4822.Whichappwillbesuitableifachildwantstowatcheducationalvideosofdifferenttopics?A.QUICKMathB.EPIC!C.ABCmouse.comD.BrainPOPJr.MovieoftheWeek23.Whatdothefourappshaveincommon?A.Theyareeducational.B.Theyareinteractive.C.Playershavequizzes.D.Theyarefreeofcharge.BMynameisMichelleRogers.FormostofmylifeIhadbeenfightingwithmybodyweight.Iwaseithergainingweightortryingtoloseit.Iwasn'thappywithmyself,andIcertainlywasn'tabletofullyenjoylife.NotonlydidIfeelbadphysically,butIfeltterribleemotionally.IalsoknewIwasn'tabletobethebestIcouldbe,andwithfailureafterfailureinlosingweight,Ijustfeltsohopelesstomakeit.Onedayin2008,Iwaslookingthroughadsonlineandsawatreadmill（跑步机）for$100.ThistimeIdecidedtostartsmallandkeepitdoable.ThefirstweekIstartedwalking15minutesonthetreadmillatafixedtimeeveryday.ThenextweekIdid16minutes.EachweekIaddedaminute.Gradually,Iincreasedspeedaswellastime.OnceIgotto30minutes,theweightstarteddroppingoff.Ididn'tloseweightatfirst,butIdidn'tgiveuplikeIdidinthepast.IrealizedIstartedfeelingbetter.Mylegsweregettingstronger.Ididn'tfeelpainfullikeIusedtowhenIgotupfrommydesk.AlltheeffortsI'dbeenputtingintofitnessmademewanttostarteatinghealthier,too.Ibeganwithsmallchangesaswell.AftertheseyearsIstartedlisteningtomybody.Itwasrefusingfoodandhabitsthatwerebadforme.Today,theextraweightisgone.Istillexerciseeverymorning.IlookandfeelthebestIhaveneverdone.Everyareaofmylifehasimprovedandbenefitedfromthischangeinme.NotonlydoIhavemyyouthfulenergy,looksandhealthback,butalsoIhavemoreconfidencethanIhaveeverhad.六校联考高一期中考试英语试题第4页（共10页）