---What number should appear next after eighty one?392781?

---It's ________．


  1. A.
    two hundred and forty-nine
  2. B.
    two hundred and forty-seven
  3. C.
    two hundred and forty-eight
  4. D.
    two hundred and forty-three
D
此題比較新穎，它既考查了英語數(shù)詞知識又考查了數(shù)學(xué)知識，要求考生找出所給數(shù)字的規(guī)律．通過觀察這幾個數(shù)字，不難找出它們的規(guī)律，即后面數(shù)字是前面數(shù)字的三倍，因此，81后的數(shù)字是243．
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