旅游产品的特征是服务成为产品构成的主体,其具体展示主要有______、______和______。
参考答案:线路 活动和食宿
— Is that man(男人) his uncle?
—_________.
A.Yes, he is B.Yes, it is C.No, she isn’t
简述腹腔和腹膜腔的关系。