考试教案_新托福模拟考试满分作文(1)

新托福模拟考试满分作文(1)　　New findings in scientific areas can examine and challenge previous assumptions. A r

新托福模拟考试满分作文(1) Newfindingsinscientificareascanexamineand challengepreviousassumptions.Arecentfindingconcerningthe meerkat,aburrow-dwellinganimalintheAfricangrasslands, hascastdoubtupontheconventionalideasofaltruism,the typeofbehaviorinwhichananimalsacrificesitsown interestsforthebenefitofanother. Meerkatswerepreviouslythoughttobeatypicalaltruistic animal.Whentheothermeerkatsfeed,thereisusuallyone meerkatwatchingoutforpredators.Thesentinelmeerkatgains nothing,itseems,foritcanneithereatnorescapequicklyand successfullyafterraisinganalarm. However,inthenewfindings,it"sshownthatthesentinel meerkathasalreadyeatenfoodbeforestandingguard,thus contradictingthethoughtthatithasanemptybellywhileon thelookout.Inadditiontothis,thesentinelisthefirsttosee apredator,soitisthefirsttoescape.Itisalsoplacednearest aburrow,makingitrelativelyeasiertoflee.Moreover,its alarmcallsmaycausethegroupeithertogatherortospread