安徽省六安市重点学校高一入学英语分班考试试题及答案

-安徽省六安市重点学校高一入学英语分班考试试题及答案一、​选择题（20题）（1）Mybrotherisinterestedin______stories.Hereadsthemeveryday.（）A.readB.readsC.readingD.toread答案：C解析：固定搭配beinterestedindoingsth.意为“对做某事感兴趣”，其中in是介词，后接动词的-ing形式。故选C。（2）______doyouusuallygotoschool?Bybus.（）A.WhatB.HowC.WhenD.Where答案：B解析：根据答语'Bybus'（乘公交车）可知，问句是在询问交通方式。询问交通方式应用疑问词How。What问什么，When问时间，Where问地点，均不符合语境。故选B。（3）Mybrother______inBeijingsincehegraduatedfromuniversityin2020.（）A.worksB.workedC.hasworkedD.willwork答案：C解析：本题考查现在完成时。句中有时间状语"sincehegraduated..."（自从他毕业以来），表示从过去某一时刻开始一直持续到现在的动作或状态，应使用现在完成时(have/has+pastparticiple)。主语Mybrother为第三人称单数，故用hasworked。（4）______isyourfather?Heisadoctor.（）A.WhatB.WhoC.WhereD.How答案：A解析：本题考查特殊疑问词的用法。根据答语'Heisadoctor'（他是一名医生）可知，问句是在询问职业。询问职业通常使用句型'Whatis/are+sb.?'或'Whatdoes/do+sb.+do?'。Who询问是谁，Where询问地点，How询问方式或身体状况，均不符合语境。故选A。（5）Thispairofshoes____toosmallforme.Couldyoushowmeanotherpair?（）A.isB.areC.wasD.were答案：A解析：考查主谓一致。主语是Thispairofshoes，中心词是pair（单数），因此谓语动词应用单数形式。虽然shoes是复数，但受pair限制。句意描述当前状态，用一般现在时is。故选A。（6）Mysisterisgood______playingthepiano.Shepracticesiteveryday.（）A.atB.inC.forD.with答案：A解析：固定搭配'begoodatdoingsth.'意为“擅长做某事”。'begoodin'通常指在某方面表现好（如学科）；'begoodfor'意为“对……有益”；'begoodwith'意为“善于应付/处理……”。根据句意“我妹妹擅长弹钢琴”，应选A。（7）Themoviewasso______thatmanypeoplefellasleephalfwaythroughit.（）A.boringB.boredC.excitingD.excited答案：A解析：本题考查形容词辨析。主语是'Themovie'（电影），指物，修饰物通常用-ing结尾的形容词，排除B、D。根据后半句'manypeoplefellasleep'（许多人睡着了）可知电影很无聊，而非令人兴奋。boring意为“令人无聊的”，bored意为“感到无聊的”。故选A。（8）Thebook______coverisbluebelongstomyteacher.（）A.whoB.whichC.whoseD.whom答案：C解析：考查定语从句关系代词。先行词是Thebook，在从句中作cover的定语，表示“书的封面”，故用whose引导。who指人，作主语或宾语；which指物，作主语或宾语；whom指人，作宾语。故选C。（9）______doyouusuallygotoschool?Bybus.（）A.WhatB.HowC.WhereD.When答案：B解析：根据答语"Bybus"（乘公交车）可知，问句是在询问交通方式。How意为“如何”，用于询问方式；What意为“什么”；Where意为“哪里”；When意为“什么时候”。故选B。（10）Iwonder____hewillcometothepartytomorrow.（）A.thatB.ifC.whatD.who答案：B解析：考查宾语从句引导词。wonder意为“想知道”，后面接宾语从句。句意是“我想知道他明天是否来参加聚会”。if或whether表示“是否”，符合语境。that引导陈述句，what和who在从句中需充当成分，而此处从句结构完整，只需表示疑问语气。故选B。（11）______isyourfavoritesubject?IlikeEnglishbestbecauseit'sinteresting.（）A.WhatB.WhoC.WhereD.When答案：A解析：考查特殊疑问词辨析。根据答语“IlikeEnglishbest”（我最喜欢英语）可知，问句是在询问“你最喜欢的科目是什么？”。What意为“什么”，符合语境；Who意为“谁”；Where意为“哪里”；When意为“什么时候”。故选A。（12）Themovieisso______thatmanypeopleareinterestedinit.（）A.boringB.boredC.interestingD.interested答案：C解析：本题考查形容词辨析。修饰物（movie）通常用-ing结尾的形容词，修饰人通常用-ed结尾的形容词。排除B、D。根据后半句'manypeopleareinterestedinit'（许多人对它感兴趣）可知，电影是有趣的，而非无聊的。故选C。（13）I'msorryIbrokeyourcup.____.Itdoesn'tmatter.（）A.You'rewelcomeB.That'srightC.NevermindD.Noproblem答案：C解析：考查情景交际中的道歉回应。当对方说“I'msorry”（对不起）时，回答者表示“没关系”常用Nevermind或Itdoesn'tmatter。A项用于回答感谢；B项意为“那是对的”；D项虽也可用于回答道歉，但在此处与后句“Itdoesn'tmatter”重复且语气稍显随意，Nevermind是最标准的教科书式回答。故选C。（14）Ifoundawalletontheground.Idon'tknowwhoseitis.Pleasehelpmefindits____.（）A.ownerB.workerC.driverD.teacher答案：A解析：本题考查名词辨析。句意为：我在地上发现了一个钱包。我不知道它是谁的。请帮我找到它的____。wallet（钱包）对应的人应该是“主人/失主”。owner意为“所有者/主人”；worker（工人）、driver（司机）、teacher（老师）均不符合语境。故选A。（15）Couldyoupleasetellme______?Sure.It'snexttothebank.（）A.whereisthepostofficeB.wherethepostofficeisC.whatisthepostofficeD.whatthepostofficeis答案：B解析：本题考查宾语从句的语序。宾语从句应使用陈述语序，即“连接词+主语+谓语”，排除A和C。根据答语“It'snexttothebank”可知，问句询问的是地点，应用where引导，故选B。（16）Wouldyoulikesomecoffee?No,thanks.I______drinkcoffee.Coffeeisbadformystomach.（）A.almostB.especiallyC.hardlyD.still答案：C解析：考查副词辨析。句意：——你想喝点咖啡吗？——不，谢谢。我几乎不喝咖啡。咖啡对我的胃不好。almost几乎；especially尤其；hardly几乎不；still仍然。根据"Coffeeisbadformystomach"可知，说话人几乎不喝咖啡，故选C。（17）Wouldyoulikesomecoffee?No,thanks.I______drinkcoffee.Coffeeisbadformystomach.（）A.almostB.alreadyC.hardlyD.still答案：C解析：考查副词辨析。句意：——你想喝点咖啡吗？——不，谢谢。我几乎不喝咖啡。咖啡对我的胃不好。almost几乎；already已经；hardly几乎不；still仍然。根据"Coffeeisbadformystomach"可知，说话人几乎不喝咖啡。故选C。（18）Lookatthesign"NoSmoking".Sorry,I______it.（）A.don'tnoticeB.didn'tnoticeC.haven'tnoticedD.won'tnotice答案：B解析：考查时态。句意：——看那个“禁止吸烟”的标志。——抱歉，我没注意到。动作发生在过去（刚才没看到），对现在造成了影响（道歉），但强调过去的动作本身，通常用一般过去时。故选B。（19）Couldyoupleasetellme______thenearestpostofficeis?Sure.It'sjustaroundthecorner.（）A.whereB.whatC.howD.when答案：A解析：本题考查宾语从句的引导词。根据答语'It'sjustaroundthecorner'（就在拐角处）可知，问句询问的是地点。where意为“在哪里”，符合语境。what询问事物，how询问方式或程度，when询问时间，均不符合题意。故选A。（20）Couldyoupleasetellme______thenearestpostofficeis?Sure.It'sjustaroundthecorner.（）A.whereB.whatC.whenD.who答案：A解析：本题考查宾语从句的引导词。根据答语"It'sjustaroundthecorner"（就在拐角处）可知，问句是在询问地点。where意为“在哪里”，符合语境；what意为“什么”；when意为“什么时候”；who意为“谁”。故选A。二、​填空题（11题）（1）Pleaseturnoffthelightsbeforeyoul______theclassroom.答案：leave解析：句意：在你离开教室之前请关灯。根据首字母l和语境'turnoffthelights'（关灯），可知此处应填动词'离开'，即leave。before引导的时间状语从句中，主语you后接动词原形。（2）Mysisterisgoodat______(swim).Shewantstojointheswimmingclub.答案：swimming解析：考查非谓语动词。begoodat意为“擅长……”，其中at是介词，后面接动词时需要使用动名词形式（v-ing）。swim的动名词形式需要双写m再加ing，即swimming。（3）Pleaseremember______(lock)thedoorwhenyouleavetheclassroom.答案：tolock解析：句意：离开教室时请记得锁门。remembertodosth.意为“记得要做某事”（事情未做）；rememberdoingsth.意为“记得做过某事”（事情已做）。根据语境'whenyouleave'，锁门这个动作尚未发生，因此应用不定式tolock。故填tolock。（4）Ifit____(rain)tomorrow,wewillstayathomeandwatchmovies.答案：rains解析：本题考查if引导的条件状语从句的时态。在if引导的条件状语从句中，遵循“主将从现”原则，即主句用一般将来时（willstay），从句用一般现在时表将来。主语it是第三人称单数，所以rain要变为rains。（5）Mybrotherenjoys______(read)booksinhisfreetime.答案：reading解析：enjoy后接动词时，必须使用动名词形式（doing），即enjoydoingsth.表示'喜欢做某事'。read的动名词形式为reading。（6）Itisimportantforus______(learn)Englishwellbecauseitiswidelyusedaroundtheworld.答案：tolearn解析：句型'Itis+adj.+forsb.+todosth.'意为“做某事对某人来说是……的”。此处it作形式主语，真正的主语是后面的不定式短语。故填tolearn。（7）It'snecessaryforus____(learn)Englishwell.答案：tolearn解析：本题考查固定句型。Itis+adj.+forsb.+todosth.是常用句型，意为“对某人来说做某事是……的”。其中It是形式主语，真正的主语是后面的动词不定式。故填tolearn。（8）Itisimportantforus______(learn)Englishwellbecauseitiswidelyusedaroundtheworld.答案：tolearn解析：本题考查句型Itis+adj.+forsb.+todosth.，意为“对某人来说做某事是……的”。其中it是形式主语，真正的主语是后面的不定式短语。故填tolearn。（9）Itisimportantforus______(learn)Englishwellbecauseitiswidelyusedaroundtheworld.答案：tolearn解析：本题考查不定式作真正主语。句型"Itis+adj.+forsb.+todosth."中，It是形式主语，真正的主语是后面的动词不定式短语。故填tolearn。（10）It'simportantforus______(keep)healthy.答案：tokeep解析：考查固定句型。句型“Itis+adj.+forsb.+todosth.”意为“做某事对某人来说是……的”。此处it是形式主语，真正的主语是后面的不定式短语。故填tokeep。（11）Pleaseturnoffthelightswhenyoul______theroomtosaveenergy.答案：leave解析：句意：当你离开房间时请关灯以节约能源。根据首字母l和语境'turnoffthelights'（关灯），可知此处应填'leave'（离开）。when引导的时间状语从句中，主语you后接动词原形。故填leave。三、​完形填空（5题）（1）Lastsummer,myfamilyandIwenttoBeijingforavacation.ItwasmyfirsttimetovisitthecapitalcityofChina.WearrivedtherebytrainonJuly15th.Theweatherwassunnyandhot.Onthefirstday,wevisitedtheForbiddenCity.Itisoneofthemostfamous1______intheworld.Thereweremanytouriststhere.Wetooklotsofphotos.Intheafternoon,wewenttoTian'anmenSquare.Itisverylargeandbeautiful.Onthesecondday,weclimbedtheGreatWall.Asthesayinggoes,"HewhohasneverbeentotheGreatWallisnota2______man."Althoughitwastiring,wefeltveryexcitedwhenwereachedthetop.Theviewfromthetopwasamazing.Onthethirdday,wevisitedtheSummerPalace.WetookaboatrideonKunmingLake.Thewaterwasclearandtheairwasfresh.Wealsotriedsomelocalfood,suchasPekingDuck.Ittasted3______.WestayedinBeijingforfivedays.Wehadawonderfultimethere.IhopetovisitBeijingagaininthefuture.ThistripmademelearnmoreaboutChinesehistoryandculture.Ithinktravelingisagoodwayto4______oureyesandrelaxourselves.答案：1.places2.true3.delicious4.open解析：1.根据前文提到的故宫（ForbiddenCity）以及常识，故宫是世界上著名的“地方/景点”之一，place的复数形式为places。2.考查谚语，“不到长城非好汉”，英文表达为HewhohasneverbeentotheGreatWallisnotatrueman。故填true。3.根据前文提到尝试了北京烤鸭等当地美食，且语境积极，形容食物味道好应用delicious。4.考查固定搭配或常用表达，openone'seyes意为“开阔眼界”。故填open。（2）Tomisamiddleschoolstudent.Helikessportsverymuch.Everymorning,hegetsupat6:00andgoes1______forhalfanhour.Afterbreakfast,hegoestoschoolbybike.Atschool,hehasfourclassesinthemorningandtwointheafternoon.HisfavoritesubjectisP.E.becausehecanplaybasketballwithhisfriends.Intheevening,heusuallydoeshishomeworkfirstandthenwatchesTVforawhile.Hegoestobedat9:30.Tomthinkskeepinghealthyisvery2______.答案：1.running2.important解析：1.gorunning是固定搭配，意为“去跑步”。根据前文他喜欢运动以及早起半小时的习惯，running符合语境。2.根据全文描述汤姆健康的生活方式，他认为保持健康是非常重要的。important符合语境。（3）Itwasasunnyday.Tomdecidedtogoforapicnicinthepark.Hepackedsomefoodanddrinksintohisbag.Onhiswaytothepark,hesawanoldmansittingonabench.Theoldmanlooked1______andtired.Tomstoppedandasked,"Areyouokay?"Theoldmansmiledandsaid,"I'mjustabithungry."Tomtookoutasandwichfromhisbagandgaveittotheoldman.Theoldmanthankedhim2______.Tomfelthappybecausehehelpedsomeoneinneed.Afterthat,hecontinuedhiswalktothepark.Whenhearrived,hefoundanicespotunderabigtree.Heenjoyedhispicnicandthoughtabouthowgooditfeelstobe3______.答案：1.hungry2.warmly3.kind解析：1.根据后文老人说"I'mjustabithungry"可知，老人看起来是饥饿的，故填hungry。2.老人接受了帮助，应该是感激地、热情地感谢，修饰动词thanked用副词warmly。3.汤姆帮助了别人，感到快乐，因为他觉得自己是善良的，故填kind。（4）Lifeisfullofsurprises.Sometimesthingsdon'tgoasweplan.Lastsummer,Idecidedtolearnhowtoswim.Iwasvery1______atfirstbecauseIcouldn'tevenfloat.Mycoachtoldmetorelaxandtrustthewater.Daybyday,Ipracticedhard.Finally,Icouldswimacrossthepool.Thisexperiencetaughtmethat2______isthekeytosuccess.Nomatterhowdifficultthetaskis,ifwekeeptrying,wewillmakeit.Now,wheneverIfaceachallenge,Iremembermyswimminglessonsandfeel3______.答案：1.nervous2.persistence3.confident解析：1.根据后文"becauseIcouldn'tevenfloat"（因为我甚至不会漂浮）可知，作者起初感到紧张或害怕，nervous（紧张的）符合语境。2.根据前文"Daybyday,Ipracticedhard"（日复一日，我努力练习）以及后文"ifwekeeptrying"（如果我们坚持尝试），可知此处强调的是坚持，persistence（坚持/毅力）符合语境。3.根据前文成功学会游泳的经历，以及"remembermyswimminglessons"，作者在面对挑战时会感到自信，confident（自信的）符合语境。（5）Lastsummer,IwenttoYunnanwithmyparents.Itwasawonderfultrip.WevisitedKunming,DaliandLijiang.Kunmingisknownasthe"SpringCity"becausetheweatherthereisniceallyearround.WesawmanybeautifulflowersintheGreenLakePark.ThenwetookatraintoDali.TheErhaiLakewassoclearthatwecouldseethefishswimminginit.Wealsorodebikesaroundthelake.Itwasreallyrelaxing.Finally,wearrivedinLijiang.TheOldTownofLijiangisveryfamous.Therearemanyoldbuildingsandnarrowstreets.Weboughtsomelocalsouvenirsforourfriends.Thefoodtherewasdelicious,especiallythecrossing-the-bridgenoodles.Althoughweweretired,wefeltveryhappy.ThistripnotonlyletmeenjoythebeautifulscenerybutalsohelpedmelearnmoreaboutChineseculture.IhopetovisitYunnanagaininthefuture.1______didthewritergotoYunnan?Hewenttherewithhis2______.WhyisKunmingcalledthe"SpringCity"?Becausetheweatheris3______allyearround.WhatdidtheydoinDali?Theyrode4______aroundtheErhaiLake.Howdidthewriterfeelaboutthetrip?Hefeltvery5______.答案：1.Who2.parents3.nice4.bikes5.happy解析：1.根据下文'Hewenttherewithhis...'可知此处询问谁去了云南，故填Who。2.根据文章第一句'IwenttoYunnanwithmyparents'可知是和父母一起，故填parents。3.根据文章第二段'becausetheweatherthereisniceallyearround'可知天气很好，故填nice。4.根据文章第二段'Wealsorodebikesaroundthelake'可知他们骑自行车，故填bikes。5.根据文章最后一段'wefeltveryhappy'可知作者感觉很开心，故填happy。四、​写作（2题）写作题1假设你是李华，你的英国笔友Peter想了解中国的中学生活。请根据以下提示给他写一封电子邮件，介绍你的学校生活。提示：1.上学时间：早上8点到下午5点；2.课程：语文、数学、英语等，最喜欢英语；3.课外活动：参加篮球俱乐部，每周二和周四训练；4.感受：忙碌但快乐。要求：1.包含所有提示要点，可适当发挥；2.词数80左右；3.开头和结尾已给出，不计入总词数。DearPeter,Howiseverythinggoing?I'mgladtotellyouaboutmyschoollife.___________________________________________________________Yours,LiHua（1）假设你是李华，你的英国笔友Peter想了解中国的中学生活。请根据以下提示给他写一封电子邮件，介绍你的学校生活。提示：1.上学时间：早上8点到下午5点；2.课程：语文、数学、英语等，最喜欢英语；3.课外活动：参加篮球俱乐部，每周二和周四训练；4.感受：忙碌但快乐。要求：1.包含所有提示要点，可适当发挥；2.词数80左右；3.开头和结尾已给出，不计入总词数。DearPeter,Howiseverythinggoing?I'mgladtotellyouaboutmyschoollife.___________________________________________________________Yours,LiHua答案：（略）解析：这是一篇应用文写作，主要介绍学校生活。写作时需注意以下几点：1.时态：主要使用一般现在时，因为描述的是日常习惯和现状。2.人称：第一人称I。3.内容覆盖：必须包含上学时间、课程设置及喜好、课外活动、个人感受四个要点。4.语言表达：使用连接词如Amongthem,Afterclass,Although等使文章连贯。注意单词拼写和语法正确性。（2）写作背景：向外国友人介绍端午节(TheDragonBoatFestival)。答案：（略）解析：本题考查文化介绍类作文。要点包括：1.时间（农历五月初五）及由来（纪念屈原）；2.习俗（吃粽子、赛龙舟）；3.意义（爱国、团结）。注意专有名词的表达（lunarmonth,Zongzi,dragonboatrace），语言要具有宣传性和感染力。五、​阅读理解（3题）阅读理解1Dearstudents,Welcometoourschoollibrary!Herearesomerulesyouneedtofollow:1.Openinghours:Thelibraryisopenfrom8:00a.m.to5:00p.m.onweekdays.Itisclosedonweekends.2.Borrowingbooks:Youcanborrowuptothreebooksatatime.Theborrowingperiodistwoweeks.Ifyoucannotreturnthemontime,pleaserenewthemonlineorattheservicedesk.3.Behavior:Pleasekeepquietinthelibrary.Donoteatordrinkinside.Mobilephonesmustbesettosilentmode.4.Lostbooks:Ifyouloseabook,youneedtopayforitorbuyanewcopyofthesameedition.Wehopeyouenjoyreadinghere!SchoolLibraryManagementOffice（1-1）Whenistheschoollibraryopen?（）A.From8:00a.m.to5:00p.m.everyday.B.From8:00a.m.to5:00p.m.onweekdays.C.Onlyonweekends.D.From9:00a.m.to4:00p.m.onweekdays.（1-2）Howmanybookscanastudentborrowatmostatonetime?（）A.One.B.Two.C.Three.D.Four.（1-3）Whatshouldyoudoifyouwanttodrinkwaterinthelibrary?（）A.Youcandrinkquietly.B.Youshouldgooutsidetodrink.C.Youcandrinkifnooneseesyou.D.Youcandrinkonlywater.答案：1-1.B1-2.C1-3.B解析：1.细节理解题。根据规则第一条"Thelibraryisopenfrom8:00a.m.to5:00p.m.onweekdays."可知，图书馆在工作日上午8点到下午5点开放。故选B。2.细节理解题。根据规则第二条"Youcanborrowuptothreebooksatatime."可知，一次最多借三本书。故选C。3.推理判断题。根据规则第三条"Donoteatordrinkinside."可知，图书馆内禁止饮食。因此如果想喝水，应该去外面。故选B。阅读理解2Mobilephoneshavebecomeanessentialpartofourdailylives.Theyallowustocommunicatewithfriendsandfamilyinstantly,accessinformation,andentertainourselves.However,thewidespreaduseofmobilephones,especiallyamongteenagers,hasraisedconcernsaboutitsimpactonhealthandsocialskills.Onthepositiveside,mobilephonesprovideconvenience.Studentscanuseeducationalappstolearnnewsubjects,lookupwords,orsolvemathproblems.Parentscanstayintouchwiththeirchildreneasily,ensuringtheirsafety.Moreover,mobilephonesenablepeopletoworkremotely,increasingflexibilityinjobs.Onthenegativeside,excessiveuseofmobilephonescanleadtohealthissues.Staringatscreensforlongperiodscancauseeyestrainandheadaches.Lackofphysicalactivityduetophoneaddictioncontributestoobesity.Furthermore,spendingtoomuchtimeonphonescanreduceface-to-faceinteractions,potentiallyweakeningsocialskillsandleadingtofeelingsofisolation.Tobalancethebenefitsanddrawbacks,expertssuggestsettinglimitsonscreentime.Schoolsandparentsshouldencourageoutdooractivitiesandreal-lifeconversations.Usingphonesresponsiblymeansknowingwhentoputthemdownandengagewiththeworldaroundus.Bydoingso,wecanenjoythetechnologywithoutlettingitcontrolourlives.（2-1）Whatisonepositiveaspectofmobilephonesmentionedinthetext?（）A.Theycauseeyestrain.B.Theyhelpstudentslearnviaapps.C.Theyreduceface-to-faceinteraction.D.Theyleadtoobesity.（2-2）Accordingtothetext,whathealthissuecanbecausedbystaringatscreensforlongperiods?（）A.ObesityB.EyestrainandheadachesC.IsolationD.Poorgrades（2-3）Whymightexcessivephoneuseweakensocialskills?（）A.Becausephonesareexpensive.B.Becauseitreducesface-to-faceinteractions.C.Becauseitimprovescommunication.D.Becauseitmakespeoplesmarter.（2-4）Whatsuggestiondoexpertsgivetobalancetheuseofmobilephones?（）A.Banmobilephonescompletely.B.Usephonesonlyforgames.C.Setlimitsonscreentime.D.Ignorethedrawbacks.答案：2-1.B2-2.B2-3.B2-4.C解析：1.细节理解题。根据第二段"Studentscanuseeducationalappstolearnnewsubjects..."可知，手机可以帮助学生通过应用程序学习。A、C、D均为负面影响。故选B。2.细节理解题。根据第三段"Staringatscreensforlongperiodscancauseeyestrainandheadaches."可知，长时间盯着屏幕会导致眼睛疲劳和头痛。故选B。3.细节理解题。根据第三段"spendingtoomuchtimeonphonescanreduceface-to-faceinteractions,potentiallyweakeningsocialskills..."可知，过度使用手机减少了面对面交流，从而削弱社交技能。故选B。4.细节理解题。根据最后一段"expertssuggestsettinglimitsonscreentime."可知，专家建议限制屏幕使用时间。故选C。阅读理解3Manypeoplethinkthatsharksaredangerousanimals.TheyareafraidofsharksbecauseofmovieslikeJaws.However,mostsharksarenotdangeroustohumans.Infact,sharksplayanimportantroleintheoceanecosystem.Sharkshavebeenaroundformorethan400mil