Which of the following is NOT an element of the code of etiquette?
A.Respect for age
B.Formal compliments
C.Proper introductions at social functions
D.Eating with a fork father than fingers
第5题
REM睡眠约占总睡眠时间的比例为
A、5%~10%
B、10%~15%
C、15%~20%
D、20%~25%
E、25%~30%
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