Finding information in today’s world is easy. The______is how you can tell if the information you get is useful or not.

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问题 Finding information in today’s world is easy. The______is how you can tell if the information you get is useful or not.

选项 A、ability
B、competition
C、challenge
D、knowledge

答案C

解析 challenge意为“挑战,艰巨任务,难题”。ability意为“能力”;competition意为“竞赛”;knowledge意为“知识”。
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