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 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 bythe 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 Prouts law 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.wouldnt C.always D.never
19.A.describe B.unit C.mix D.reveal
20.A.different B.usual C.important D.chemical
雅思口语Part 1答题技巧
雅思口语天天练:如何描述我的心情
雅思口语天天练:失眠表达知多少?
中国考生雅思口语低分原因:generalized & memorized
雅思口语题目整理汇总(截止6月20日)
雅思口语天天练:怎样回答How are you?
雅思口语分类词汇:Poultry 家禽肉类
雅思口语Part 1范文:Hometown
雅思口语考试考场的八个注意事项
雅思口语Part 1的答题要点
雅思口语高分必备的6个细节
最易用错的5个雅思口语短句
雅思口语Part2高分范文:favorite time
雅思口语高分要注意原创性
雅思口语7分技巧:妙用词性转换
雅思口语高分答题技巧:谚语答题法
应对雅思口语新话题的方法
雅思口语范文:交通话题
雅思口语话题准备中的两个难点
雅思口语低分的原因及对策
雅思口语学习方法:英汉文化差异
雅思口语的3大实用练习方法
快速提高雅思口语水平的小技巧
雅思口语考场实用技巧:举一反三
考官百听不厌的32句经典雅思口语
保证雅思口语流利连贯的两点建议
每日雅思词汇:有关“hot”的短语表达
每日雅思词汇:端午节特色词汇
雅思口语Part2高分范文:ideal home
雅思口语评分标准:口语流利度的练习
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