Life is full of .School is thought as the most ­­­ obstacle(障碍) in the lives o

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A. challenge; challenging
B. challenges; challenged
C. challenges; challenging
D. challenging; challenges
解析：考查词义辨析：challenge是名词“挑战”，是不可数名词，做“一件挑战的事情”做可数名词， challenging是形容词：有挑战的，句意：生活充满挑战。学校被认为是年轻人生活中最有挑战的障碍。选C。