Everyonehasadifferentdefinitionaboutecotourism,butmostpeopleagreethatecotourism(生态旅游)must:【1】D【解析】根据第一段的第3点besustainable,thatis,makeaprofitwithoutdestroyingnaturalresources可知，生态旅游的要求之一就是不能破坏环境的情况下获取利润【2】B【解析】根据第二段So,forexample,inatrueecotourismproject,anaturereserveallowsasmallnumberoftouriststovisititsrareanimalsandusesthemoneythatisgeneratedtocontinuewithimportantconservationwork可知，答案为B【3】C【解析】根据第二段Thiswaytheyexperiencethelocalcultureanddonottakepreciousenergyandwaterawayfromthelocalpopulation可知，答案为C【4】B【解析】根据Thistypeoftourismcanonlyinvolvesmallnumbersofpeople,soitcanbeexpensive.Therearesomeprinciplesofecotourism的分析，联系上下文可知，it指代的是生态旅游【5】D【解析】根据第三段关于生态旅游的描述可知，本文未提及D