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
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
解析： 句意为：当今世界找信息很容易，但困难的事是你如何辨别你所获得的信息是否有用。A.知识；B.能力；C.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。
答案： D