Life is full of _______.School is thought as the most ­­­_______ obstacle(障礙) in the lives of youth today.
A．challenge; challengingB．challenges; challenged
C．challenges; challengingD．challenging; challenges
C   

試題分析：考查詞義辨析：challenge是名詞“挑戰(zhàn)”，是不可數(shù)名詞，做“一件挑戰(zhàn)的事情”做可數(shù)名詞， challenging是形容詞：有挑戰(zhàn)的，句意：生活充滿挑戰(zhàn)。學(xué)校被認為是年輕人生活中最有挑戰(zhàn)的障礙。選C。
點評：詞義辨析類題目一定要在句意中辨析這些詞的用法，使之符合語境。還有單復(fù)數(shù)問題也是考查重點，這里的challege還要注意是可數(shù)名詞還是不可數(shù)名詞。
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