The of surfing the Internet is how you can tell whether the information is true or not.
A. ability
B. petition
C. challenge
D. knowledge
网友回答
A. ability
B. petition
(答案→)C. challenge
D. knowledge
解析：考查名词辨析。句意“上网伴随的具有挑战性的问题是怎样分辨信息是否是真的。”A“能力”；B“竞争”；C“挑战，怀疑”；D“知识”。故选C。