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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．knowledge B．ability

    C．competition D．challenge

     

    D

    【解析】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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