2021年12月英语四级听力:PopulationGrowth
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2021年12月英语四级听力:Population Growth思维导图模板大纲
PopulationGrowth
Itiswell-knownthattherehasbeenadrasticincreaseinworldpopulation.Butitisprobablyleswell-knownthattheextinctionrateofwildlifespeciesisexperiencingaparalleltrend.
TaketheUnitedStatesforinstance.In1990,U.S.populationreachedanunprecedentedlevelof250million,whichisapproximately250timesofthatof1800.Ontheotherhand,wildlifespeciesaredisappearingfromthecountryatanalamp3ingrate.By1990,about70wildlifespecieswouldneverbeseeninU.S.Wearefullyjustifiedindeclaringthattheexplosivepopulationgrowthhashadanadverseeffectonthesurvivalofwildlifespeciesandwillbeaconstantthreattothewildliferesourcesifnoimmediateactionsaretaken.
Nothinghaseverequaledthemagnitudeandspeedwithwhichthehumanspeciesisalteringthephysicalandchemicalworld.Ithasbeendemolishingtheenvironmentwearelivingin.
Usefulwordsandexpressions:
1.drastic激烈的
2.parallel平行的
3.trend倾向
4.unprecedented空前的
5.magnitude大小,数量
6.alter改变
7.demolish毁坏