Day5AAntarcticaisoneofthelastrealwildernesses____1____(leave)ontheearth.Sinceitwasfirstexploredinthelate19thandearly20thcenturies,variouscountries____2____(try)touseitfordifferentpurposes.However,in1961,12countriesagreedtosigntheAntarcticTreaty.Thismeansthattheentireareawas____3____nuclear-freezoneandcouldonlybeusedfor____4____(peace)purposes.Antarcticabecamethebiggestlaboratoryintheworld,withmanyscientists____5____(conduct)researchthere.Today42countrieshavesignedthetreaty,andhavesentscientiststostudyinthearea.Everysummer,3,000scientistsarrivetocarryoutavarietyofresearch____6____(project).UnliketheArcticinthenorth,____7____isjustmadeupofice,Antarcticaisanactuallandmass.Infact,itisone____8____(ten)ofthelandsurfaceoftheearth.Over140millionyearsago,Antarcticawasagreenandlivingplace.However,thelandmass____9____(gradual)movedtothecolderareasintheSouth,andnowitisjustasfrozenastheArctic.Tourismhasfinallyreachedthegreatfrozenwilderness.Peoplecometoseethelocalbirdlife,togomountaineering,ortovisittheSouthPole.____10____wearenotcareful,itwillnotremainawildernessformuchlonger.BXiaoWei,aChinesestudent,forthefirsttimelefthermotherland—Chinatostudyforabusiness____1____(qualify)inLondon.Likemostforeignstudents,shehastocompletethepreparationcoursebeforeapplying____2____adegreecourse.XiaoWeiexplained____3____tookupallherconcentrationinthebeginningtogetusedtoanewwayoflifethere.Sometimesshefeltlikeachildbecauseshehadtolearnalmosteverything.____4____(lucky),sheliveswithahostfamilywhoalwaysgivehergoodadviceandalsothechance____5____(learn)moreaboutthenewculture.Meanwhile,itisasubstitutefamilytogivehercomfortwhenshemissesherfamily.Thepreparationcourse,inXiaoWei’sopinion,ismost____6____(benefit),makingherunderstandtheacademicrequirementsofawesternuniversity.Towriteanessay,asfarasXiaoWei’stutor____7____(concern),themostimportantthingwasherownopinion.Herequiredhertoreadlotsoftexts____8____containdifferentopinionsandanalyzethem.Besides,shewasencouragedtogiveherownopinion,explainitbyrefe