(2006·天津)Finding information in today's world is easy. The ________ is how you can tell if the information you get is useful or not.


  1. A.
    ability
  2. B.
    competition
  3. C.
    challenge
  4. D.
    knowledge
C
句意：在當今世界找到信息很容易，困難在于你如何判斷你所獲取的信息是否有用。challenge"挑戰(zhàn)； (具有挑戰(zhàn)性或刺激性的) 任務"；ability"能力"；competition"競賽"。
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