【題目】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】D
【解析】考查名詞。句意：當(dāng)今世界找信息很容易，但困難的事是你如何辨別你所獲得的信息是否有用。A. knowledge"知識(shí)"；B.ability”能力”；C.competition”比賽，競(jìng)賽“；D.challenge“ 挑戰(zhàn)，困難的事”，選D。

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