Finding information in today’s world is easy．The_______is how you can tell if the information you get is useful or not。
A．a(chǎn)bilityB．eompetitionC．challenge D．knowledge
C
答案為C。句意：在當(dāng)今時(shí)代中找到信息是件很容易的事，難的是如何區(qū)分你獲得的信息是否有用。challenge意為‘‘挑戰(zhàn)，艱巨任務(wù)，難題”；ability意為“能力”；competition意為“競(jìng)爭(zhēng)”。
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