(2013·安徽蚌埠一次质检)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. petition
D. challenge
网友回答
A. knowledge
B. ability
C. petition
(答案→)D. challenge
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；petition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。