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(2014·安徽蚌埠第一次教学质量检查)Finding information in today’s world is easy.The  ________is how you can tell if the information you get is useful or not.
A.knowledge B.ability
C.competition D.challenge
D
句意为:当今世界找信息很容易,但困难的事是你如何辨别你所获得的信息是否有用。A.知识;B.能力;C.竞赛。challenge挑战,艰巨任务。又如:She likes her job to be a challenge.她喜欢艰巨的工作。
答案: D
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