最佳答案:in order to improve the students' mental and physical health,we need to alternat
最佳答案:1.Be responsible to contact teachers and convey the notification2.Carry out the
最佳答案:Huangshan Mountain on third the tour inspection moves one,program arrangement on
最佳答案:如果甲和乙都参加,则他们可以从翻译、礼仪、导游中选择两项,有A3取2=6种情况.其他三人有A3取2=6种情况,所以共有6*A3取2=36种如果甲乙只有一人参加,