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2025届全国名校高三单元检测示范卷·(四)4试题(数学)试卷答案
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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
15.用灭菌后的丝绒覆盖在一块与培养皿同样大小(或略小)的木制圆柱体上,制成“印章”,将无菌“印章”轻盖在已长好菌落的原培养基上,然后不转动任何角度,“复印”至新的培养基上,这种接种方法称为影印法。人工诱变可使野生型菌株突变为营养缺陷型菌株(不能在基本培养基上生长,必须在添加该种营养物质的培养基上生长),如图是科研人员利用影印法初检某种氨基酸缺陷型菌株的过程。下列说法错误的是A.a中为诱变处理后经稀释涂布平板法接种形成的菌落B.c比b中的培养基所含氨基酸种类可能更齐全C.和②过程每组的培养温度和时间必须相同且适宜D.挑取菌落B培养才能选出该氨基酸缺陷型菌株
