英语完形填空及答案解析

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1、英语完形填空及解析Daltonwonderedwhytheheavierandlightergasesintheatmospheredidnotseparateasoilandwaterdo.Hefinallyconcludedthattheconstituent___1____mustexistintheformof___2____particlesoratomsandthatthese___3____becompletelymixedtogetherinthe___4____.Thisthrewanewligh

2、tin___5____lawsofdefiniteproportions.Itwas___6____necessarytosupposethattheatoms___7____combinesintossmallgroupsofuniform___8____andsoformmorecomplexsubstance;___9____themysteryofthislawwas___10____.Daltonsuggested,forexample,thatcarbonmonoxide___11____formedb

3、ytheonewithone___12____ofatomsofcarbonandoxygen,___13____carbondioxideresultsfromasingle___14____ofcarbonunitingwithtwoatoms___15____oxygen.Assumingthistobetrue,___16____thedefiniteproportionsofProut'slaw(___17____allchemicalcompoundsthedifferentconstituents__

4、_18____enterinunvaryingproportions)wouldnaturally___19____therelativeweightsofthemany___20____kindsofatoms.711.A.gasesB.piecesC.thingsD.gas2.A.timelyB.trimmedC.tinyD.topical3.A.oughtB.couldC.willD.must4.A.skyB.atmosphereC.oxygenD.environment5.A.variousB.manyC.

5、theD.those6.A.onlyB.tooC.thatD.extremely7.A.shouldB.wereC.getD.could8.A.constructB.structureC.pieceD.feature9.A.butB.alsoC.thusD.nevertheless10.A.solvedB.discoveredC.brokedD.told11.A.mustB.beenC.wereD.is12.A.puttingB.pairingC.placingD.preparing13.A.whileB.when

6、C.thereforeD.also14.A.pieceB.typeC.atomD.measure15.A.fromB.inC.ofD.for16.A.thenB.soC.byD.that7117.A.fromB.inC.toD.for18.A.areB.wouldn’tC.alwaysD.never19.A.describeB.unitC.mixD.reveal20.A.differentB.usualC.importantD.chemical解析1.【答案】A【解析】根据上文中的heavierandlighter

7、gases可以确定,本空中应填入“组成的气体”，即constituentgases。2.【答案】C　【解析】根据句子意思判断,句中的词意为微粒的意思，选项C.tiny合乎题意。3.【答案】D　【解析】情态动词must在这里是“必定、必须”的意思。4.【答案】B　【解析】sky意为“天空”，atmosphere意为“大气”,oxygen意为“氧气”,environment意为“环境”,只有B项正确。5.【答案】C71　【解析】这帮助解释了大气组成气体的比例确定原理。因为是特指这一原理，用定冠词the。6.【答案】A　

8、【解析】onlynecessary的意思是“仅仅是必要”。故A正确。7.【答案】D　【解析】根据句子意思判断,could是“能够”的意思。8.【答案】B　【解析】根据句子意思判断,这里需要“结构”这个词，而B合乎题意。9.【答案】C　【解析】but，nevertheless表示转折意为“但是”，“然而”;thus意为“因此”，如Therehasbeennor