三级完型填空:ClozeTest25(含答案)
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Dalton wondered why the heavier and lighter1 gases in the atmosphere did not separate as oil and water do.He finally concluded that the constituent2 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 in 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, 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 Prout's law ( 17 all chemical compounds the different constituents3 18 enter in unvarying proportions) would naturally 19 the relative weights of the many 20 kinds 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


  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.for


  18.A.are B.wouldn?t C.always D.never


  19.A.describe B.unit C.mix D.reveal


  20.A.different B.usual C.important D.chemical

  Cloze Test 32


  1.【答案】A


  【解析】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.【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】C


  【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


  【解析】only necessary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There has been no rain.Thus, the crops are likely to suffer.一直没有下雨,因此庄稼可能会受害。这里与上文有因果关系,故应选C。


  10.【答案】A


  【解析】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.【答案】D


  【解析】因为是表一般规律,又是单数,所以用is这个词。


  12.【答案】B


  【解析】Pair这里是“匹配,配成双”的意思。


  13.【答案】A


  【解析】while表示对比。如:Some substances are soluble4, while others are not.一些物质是可溶的,而另一些物质是不可溶的。


  14.【答案】C


  【解析】根据句子意思判断, atom正确。


  15.【答案】C


  【解析】of表示“含量,分量”。


  16.【答案】A


  【解析】then的意思是next, after that。


  17.【答案】D


  【解析】for的意思是“对于,就……而言”。


  18.【答案】C


  【解析】根据句子意思判断。


  19.【答案】B


  【解析】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.【答案】A



点击收听单词发音收听单词发音  

1 lighter 5pPzPR     
n.打火机,点火器;驳船;v.用驳船运送;light的比较级
参考例句:
  • The portrait was touched up so as to make it lighter.这张画经过润色,色调明朗了一些。
  • The lighter works off the car battery.引燃器利用汽车蓄电池打火。
2 constituent bpxzK     
n.选民;成分,组分;adj.组成的,构成的
参考例句:
  • Sugar is the main constituent of candy.食糖是糖果的主要成分。
  • Fibre is a natural constituent of a healthy diet.纤维是健康饮食的天然组成部分。
3 constituents 63f0b2072b2db2b8525e6eff0c90b33b     
n.选民( constituent的名词复数 );成分;构成部分;要素
参考例句:
  • She has the full support of her constituents. 她得到本区选民的全力支持。
  • Hydrogen and oxygen are the constituents of water. 氢和氧是水的主要成分。 来自《简明英汉词典》
4 soluble LrMya     
adj.可溶的;可以解决的
参考例句:
  • These tablets are soluble in water.这些药片可在水中溶解。
  • Camphor is soluble in alcohol.樟脑在酒精中可以溶化。
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