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
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2016秋科普版英语五上Lesson 10《There is a horse under the tree》word教案
2016秋科普版英语三上Lesson 9《What colour is the cap》(第3课时)word教案
2016春科普版英语六下Lesson 3《Did you go boating last Sunday》ppt课件3
2016秋科普版英语三上Lesson 7《Is it a bird》(第2课时)word教案
2016秋科普版英语五上Lesson 3《A computer has a keyboard》word教案
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2016秋科普版英语三上Lesson 8《What’s this》(第2课时)word教案
2016春科普版英语六下Lesson 1《I’m not feeling well》ppt课件2
2016春科普版英语六下Lesson 6《Is there a library near here》ppt课件1
2016春科普版英语六下Lesson 3《Did you go boating last Sunday》ppt课件2
2016春科普版英语六下Lesson 1《I’m not feeling well》ppt课件4
2016春科普版英语六下Lesson 7《Where do the tigers come from》ppt课件1
2016秋科普版英语三上Lesson 8《What’s this》(第1课时)word教案
2016秋科普版英语三上Lesson 7《Is it a bird》(第3课时)word教案
2016秋科普版英语三上Lesson 8《What’s this》word说课稿
2016春科普版英语六下Lesson 3《Did you go boating last Sunday》ppt课件1
2016秋科普版英语三上Lesson 8《What’s this》(第3课时)word教案
2016秋科普版英语三上Lesson 9《What colour is the cap》(第2课时)word教案
2016秋科普版英语五上Lesson 1《What is she doing》word教案
2016春科普版英语六下Lesson 2《Did you play basketball yesterday》ppt课件2
2016秋科普版英语三上Lesson 7《Is it a bird》(第1课时)word教案
2016秋科普版英语三上Lesson 5《How old are you》word教案2
2016春科普版英语六下Lesson 4《What did you do last saturday》ppt课件2
2016春科普版英语六下Lesson 1《I’m not feeling well》ppt课件3
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2016春科普版英语六下Lesson 2《Did you play basketball yesterday》ppt课件1
2016春科普版英语六下Lesson 2《Did you play basketball yesterday》ppt课件4