Population experts say that by 2050 the world will have about 2 billion people aged over 60,____as today.


  1. A.
    as three times
  2. B.
    three times as many
  3. C.
    three times many
  4. D.
    three times many as
B
解析：
考察倍數(shù)表達(dá)法。倍數(shù)表達(dá)法：A be 倍數(shù) as adj/adv的原級 as B;故B正確。句意：人口專家說在2050年世界上將有20億60歲以上的人口，是現(xiàn)在的3倍。
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