问题
选择题
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
答案：D
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；competition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。