听下面一段材料, 回答第1、2题. 1. How many times has the man been to Mexico City? A. Once. B. Twice. C. Three times. 2. What did the woman do yesterday? A. She visited a museum. B. She saw a film. C. She went swimming
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【单选题】Sludge may form in the crankcase of an air conditioning compressor as a result of ______.