2008年12月英语四级完形填空考前练习25CET4考试

文章作者 100test 发表时间 2009:04:30 06:13:42
来源 100Test.Com百考试题网


  第二十五篇
  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 (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.
  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

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