It is impolite for people to leave abruptly without saying anything especially for business partner
A. 对
B. 错
“So Long ”means "Long time no see"
A. 对
B. 错
It is proper to say "Happy landing" whenseeing people off at the railway station.
A. 对
B. 错
目前,以下哪些原料可用于普通食品里?
A. 银杏
B. 银杏叶
C. 人参(人工种植)
D. 人参叶(人工种植)
E. 人参组培物