Remember to think actively as you listen in class, ____ you may fall asleep.
A．butB．a(chǎn)ndC．orD．so
C 

試題分析：考查連詞：A. but但是B. and并且C. or 否則D. so因此，句意：記得上課時要積極地思考，否則會睡著。選C。
點評：連詞的辨析要放在上下文總進行，同時要注意一些形式相近的連詞的詞義辨析。這幾個都是�？嫉倪B詞。
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