题目

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 答案：D　[考查名词辨析。句意：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。knowledge“知识”；ability“能力”；competition“竞赛”；challenge: a new or difficult task“挑战；艰巨任务”。]

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