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1、2018 年成人英语三级完形填空复习题及答案(6)Dalton wondered why the heavier and lighter gases in the atmosphere did not separate as oil and water do.He finally concluded that the constituent 1 must exist in the form of 2 particles or atoms and that these 3 be completely mixed together in the 4.This threw a new light i
2、n 5 laws of definite proportions.It was 6 necessary to suppose that the atoms 7 combinesintossmall groups of uniform 8 and so form more complex substance;9 the mystery of this law was 10.Dalton suggested,for example,that carbon monoxide 11 formed by the one with one 12 of atoms of carbon and oxygen,
3、13 carbon dioxide results from a single 14 of carbon uniting with two atoms 15 oxygen.Assuming this to be true,16 the definite proportions of Prouts law(17 all chemical compounds the different constituents 18 enter in unvarying proportions)would naturally 19 the relative weights of the many 20 kinds
4、 of atoms.1.A.gases B.pieces C.things D.gas 2.A.timely B.trimmed C.tiny D.topical 3.A.ought B.could C.will D.must 4.A.sky B.atmosphere C.oxygen D.environment 5.A.various B.many C.the D.those 6.A.only B.too C.that D.extremely 7.A.should B.were C.get D.could 8.A.construct B.structure C.piece D.feature
5、 9.A.but B.also C.thus D.nevertheless 10.A.solved B.discovered C.broked D.told 11.A.must B.been C.were D.is 12.A.putting B.pairing C.placing D.preparing 13.A.while B.when C.therefore D.also 14.A.piece B.type C.atom D.measure 15.A.from B.in C.of D.for 16.A.then B.so C.by D.that 17.A.from B.in C.to D.
6、for 18.A.are B.wouldnt C.always D.never 19.A.describe B.unit C.mix D.reveal 20.A.different B.usual C.important D.chemical 1.A 根据上文中的 heavier and lighter gases 可以确定，本空中应填入”组成的气体”，即 constituent gases.2.C 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.D 情态动词 must 在这里是”必定、必须”的意思。4.B sky 意为”天空”，atmosphere 意为”大气”，o
7、xygen 意为”氧气”，environment 意为”环境”，只有 B 项正确。5.C 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.A only necessary 的意思是”仅仅是必要”。故 A 正确。7.D 根据句子意思判断，could 是”能够”的意思。8.B 根据句子意思判断，这里需要”结构”这个词，而 B 合乎题意。9.C but，nevertheless 表示转折意为”但是”，”然而”;thus意为”因此”，如 There has been no rain.Thus,the crops are likely to suffer.一直没有下雨，因
8、此庄稼可能会受害。这里与上文有因果关系，故应选 C.10.A solve 相当于 find a solution or an answer to，意为”解决”、”解开”，如：solve a problem(a puzzle,a mystery);discover相当于 find something existing but not known before，意为”发现”，如：discover a place(a fact,the truth)。因此应选 A.11.D 因为是表一般规律，又是单数，所以用 is 这个词。12.B Pair 这里是”匹配，配成双”的意思。13.A while 表示对比。如：Some substances are soluble,while others are not.一些物质是可溶的，而另一些物质是不可溶的。14.C 根据句子意思判断，atom 正确。15.C of 表示”含量，分量”。16.A then 的意思是 next，after that.17.D for 的意思是”对于，就而言”。18.C 根据句子意思判断。19.B describe 意为”描述”;unite意为”结合，合并”;mix意为”(不同的东西)混合在一起”，如：mix flour and water;reveal意为”揭露，揭示”。20.A