英语完形填空及解析
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 in ___5____ laws of definite proportions. It was ___6____ necessary to suppose that the atoms ___7____ combinesintos small 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 constituents ___18____ enter in unvarying proportions) would naturally ___19____ the relative weights of the many ___20____ kinds of atoms.
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1. A. gases 2. A. timely topical 3. A. ought 4. A. sky
environment 5. A. various those 6. A. only extremely 7. A. should
8. A. construct feature 9. A. but nevertheless 10. A. solved 11. A. must 12. A. putting preparing 13. A. while 14. A. piece measure
B. pieces C. things D. gas B. trimmed
C. tiny
D.
B. could C. will D. must B. atmosphere C. oxygen
D.
B. many C. the D.
B. too C. that D.
B. were C. get D. could
B. structure C. piece
D.
B. also C. thus D.
B. discovered C. broked D. told B. been
C. were
D. is B. pairing
C. placing
D.
B. when C. therefore D. also
B. type
C. atom
D.
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15. A. from 16. A. then
B. in
C. of
D. for
D. that
B. so B. in
C. by
17. A. from 18. A. are never
C. to D. for
D.
B. wouldn’t C. always
19. A. describe B. unit reveal
20. A. different chemical 解析 1.【答案】A
C. mix D.
B. usual C. important D.
【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
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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,
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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 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.【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
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英语完形填空及答案解析
