Finding information in today’s world is easy．The is how you can tell if the information you get is useful or not。
A. ability
B. eompetition
C. challenge
D. knowledge
网友回答
A. ability
B. eompetition
(答案→)C. challenge
D. knowledge
解析：答案为C。句意：在当今时代中找到信息是件很容易的事，难的是如何区分你获得的信息是否有用。challenge意为‘‘挑战，艰巨任务，难题”；ability意为“能力”；petition意为“竞争”。