Many scholars consider the Sumerians’ development of trade as the birth of travel.When we describe the type of tourism w

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Many scholars consider the Sumerians’ development of trade as the birth of travel.When we describe the type of tourism which is less destructive, we may use terms as：A:对 B:错答案: 对A:green tourism B:eco-tourism C:responsible tourism D:sustainable tourism 答案: green tourism; eco-tourism; responsible tourism; sustainable tourism