云南省特岗教师招聘试题(初中英语科目六)参考答案及解析

plantsitmusthaveeveryday,itkillssmalltreesandunderbushes,andpullsbranchesoffbigtrees.ThisresultsinnumerousopenspacesinbothdeeptropicalforestsandinthewoodlandsthatcoverpartoftheAfricansavannas.Intheseopenspacesarenumerousplantsinvariousstagesofgrowththatattractavarietyofotherplanteaters.Taketherainforestsforexample.Intheirnaturalstate,thespreadingbranchesoverheadshutoutsunlightandpreventthegrowthofplantsontheforestfloor.Bypullingdowntreesandeatingplants,elephantsmakeopenspaces,allowingnewplantstogrowontheforestfloor.Insuchsituations,esuitableforlargehoofedplanteaterstomovearoundandforsmallplanteaterstogettheirfoodaswell.eanendangeredspecies.Iftheelephantdisappears,scientistssay,manyotheranimalswillalsodisappearfromvastareasofforestandsavanna,greatlychangingandworseningthewholeecosystem.