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. petition
C. challenge
D. knowledge
网友回答
A. ability
B. petition
(答案→)C. challenge
D. knowledge
解析：名词辨析。A能力；B竞争；C挑战；D知识；结合句意可知C正确。句意：在当今世界寻找信息是很容易的。挑战是你如何才能够辨别你得到的信息是否有用。