【题目】Mr Li has some trouble sleeping, so drinking a glass of milk before going to bed every night is his common _________.
A. practice B. experience
C. sense D. duty
在线课程【答案】A
【解析】考查名词辨析：A. practice练习，做法; B. experience经验; C. sense感知；D. duty责任，值日。句意：李先生睡觉有困难，所以每天晚上睡觉前喝杯牛奶是他的惯例。commom practice是“惯例”，故选A。