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serioushealthproblemsafterrocketdebrislandedintheirregionsin2012,alocaldoctortoldtheBBC.30.Whichofthefollowingcanberegardedasspacejunk?A.Anabandonedspacestation.B.Aspacecraftorbitingthemoon.C.Acrateronthemoon'ssurface.D.AsatelliteworkinginlowEarthorbit.31.Whatdoestheunderlinedword"it"refertoinparagraph2?A.Trackingtherocket.B.Locatingthecrater.C.Cleaningupthespacejunk.D.Findingouttherocket'sorigin.32.Whydoestheauthormentionthedamagecausedbytinyspacedebrisin2016?A.Tocomparethecffectsofdebrisofdifferentsizes.B.Toprovethespacedebrisproblemisgettingworse.C.Toillustratethepotentialdangersofspacejunk.D.Toexplainthenecessityofremovingspacejunk.33.Whatcanbeinferredaboutspacejunkfromthelastparagraph?A.It'slikelytocauseaglobalenvironmentalcrisis.B.Itcanposealastingthreatifitremainsintheatmosphere.C.It'simpossibletostopitfromenteringtheatmosphere.D.Thebiggestthreatcomesfromthetoxicmaterialscontainedinspacejunk.EAsisknowntousall,thestorieswesharewithoneanotheraresignificant,whichshowsour第10页共12页
3.下列有关食物或作物保存方法的叙述,错误的是A.夏季要吃“冰西瓜”,宜将西瓜置于冰箱冷藏室,避免温度过低造成细胞死亡B.小麦种子收获后,通常先充分晾晒减少水分,再进行储藏C.泡菜利用高盐环境来抑制微生物生长,延长保存时间D.雪峰蜜桔运至北方需要保持低温、低氧、千燥的环境,以延长保藏时间
