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1、1.ProblemsintheNewCentury(举例法说明文)Writeanexpositoryessayontheproblemsmanwillbefacedwithinthenewcentury.Inthenewcentury,humanbeingswillbefilledwithhopeandlivemoreadvancedlife.Whatusedtobedepictedinsciencefictionscanbetherealityofthenearfuture.However,manwillalsohavetoconfron
2、twithsomeproblemsthatwillcurtail(剥夺)humanbeingsoftheirexistence.Firstofall,pollutionofallformssuchaslandpollution,noisepollution,airpollutionandwaterpollutionareworseningwitheachpassingday.Peoplecomplainallovertheworldthatitisbecominghardertobreatheandwateristurningundrink
3、able.Alsoforestsarebeingfelledataveryfastrate.Thepollutionsaregettingsoterriblethatinsomecountrieswecan’tfindcleanandclearriversandwhitecloudsinthesky!Whenthechildrendrawapictureoftheirsurroundings,theypaintthegreentreesingray,theredsuningray,everythingingray,andtheycan’tf
4、indapureenvironmentexceptinthebooks.Additionally,theexplosionofpopulationinsomepartsoftheworldismanifestingitsterribleresults.Humanbeingswil1haveoutgrowntheearth’sresources,andpeoplewillrunahighriskofstarvationanddiseasesresultingfromovercrowding.Induecourse,manwouldbeforc
5、edoutoftheearthifthepresenttrendwerenotreversed.Whatismore,inthepastcenturywehadmanydisastrouswars.Butthereisstillpotentialthattheatomicbombwillbeusedbysomepoliticiansinordertokeepregionalhegemony.Ifitshouldhappen,theexp1osioncouldeasilyleadtothedestructionofcivilization.M
6、oreseriously,thedepersonalizationofhumanrelationshipsandtheweakeningofspiritualvaluesareaggravatingduetothestresscausedbythebusyschedulesandtheextremepursuitofmoney.Thiswillfurthercontributetoman’sisolationandloneliness.Apparently,withalltheseproblemsfacinghumanbeings,itse
7、emstobeoverwhelminglyurgenttoconquerthemonebyonebecausewehaveonlyoneearthanditisourhome.Inthenewcentury,wemusttryourbesttohealtheworldandmakeitabetterplaceforyou,formeandforthechildrenwhowillcometothisworld.2.Theexpensesofcollegestudentsarehigh（举例法说明文）Accordingtooneofmytea
8、cherswhograduatedfromuniversityin1983,hiscollegeexpenseswereonlyabout20yuanspermonth,cove
