2021英语四级听力:PopulationGrowth
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2021英语四级听力:Population Growth思维导图模板大纲
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
树图思维导图提供 RAFT 聚合、非均相聚合、可控性、嵌段共聚物、功能化/Macromolecules/2021 在线思维导图免费制作,点击“编辑”按钮,可对 RAFT 聚合、非均相聚合、可控性、嵌段共聚物、功能化/Macromolecules/2021 进行在线思维导图编辑,本思维导图属于思维导图模板主题,文件编号是:795118b22e35ace6c19fe83b4028bd4e
树图思维导图提供 RAFT 聚合、非均相聚合、可控性、嵌段共聚物、功能化/Macromolecules/2021 在线思维导图免费制作,点击“编辑”按钮,可对 RAFT 聚合、非均相聚合、可控性、嵌段共聚物、功能化/Macromolecules/2021 进行在线思维导图编辑,本思维导图属于思维导图模板主题,文件编号是:ab5d022c55bbbb8be1f07807f5259082