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Finding information in today's world is easy.The ________ is how you can tell if the information you get is useful or not.
A.knowledgeB.ability
C.competitionD.challenge
D
D 句意:当今世界找信息很容易。但挑战是你如何辨别你所获得的信息是否有用。knowledge知识;ability能力;competition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。
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