The       of surfing the Internet is how you can tell whether the information is true or not.
A．a(chǎn)bilityB．competitionC．challengeD．knowledge
C
考查名詞辨析。句意“上網(wǎng)伴隨的具有挑戰(zhàn)性的問題是怎樣分辨信息是否是真的�！盇“能力”；B“競爭”；C“挑戰(zhàn)，懷疑”；D“知識”。故選C。
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