If you happen to see the process of cooking in a restaurant, you might see the cook using rubbish oil, which is a mon in China nowadays.
A. sense
B. rule
C. practice
D. activity
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(答案→)A. sense
B. rule
C. practice
D. activity
解析：考查词义辨析，sense意识，rule规则，practice实践，activity活动，a mon sense 常识，为固定短语，故选A。