2. 外语
  3. (This passage was written prior to 1950) We now know that what constitutes practically all of matter is empty spa

(This passage was written prior to 1950) We now know that what constitutes practically all of matter is empty spa

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问题     (This passage was written prior to 1950)
         We now know that what constitutes practically
      all of matter is empty space; relatively enormous
      voids in which revolve with lightning velocity
Line infinitesimal particles so utterly small that they
(5) have never been seen or photographed. The exis-
      tence of these particles has been demonstrated by
      mathematical physicists and their operations
      determined by ingenious laboratory experiments.
      It was not until 1911 that experiments by Sir
(10) Ernest Rutherford revealed the architecture of the
      mysterious atom. Moseley, Bohr, Fermi, Millikan,
     Compton, Urey, and others have also worked on
     the problem.
        Matter is composed of molecules whose aver-
(15) age diameter is about 1/125 millionth of an inch.
     Molecules are composed of atoms so small that
     about 5 million could be placed in a row on the
     period at the end of this sentence. Long thought
     to be the ultimate, indivisible constituent of mat-
(20) ter, the atom has been found to consist roughly of
     a proton, the positive electrical element in the
     atomic nucleus, surrounded by electrons, the
     negative electric elements swirling about the
     proton.
By referring to the period at the end of the sentence (lines 16-18), the author intends to point up the atom’ s
选项 A、density
B、mystery
C、velocity
D、consistency
E、minuteness
答案E
解析
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