(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.
- A.
ability
- B.
competition
- C.
challenge
- D.
knowledge
C
句意：在當(dāng)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(wù)"；ability"能力"；competition"競(jìng)賽"。
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