【答案解析】Tourism represents a kind of pleasant activity that combines sightseeing, recreation and health care. Tourism has been developing all along with the progress of the times.
Since the middle of the 20th century, modem tourism has sprung worldwide. Tourism is becoming an important bridge of international cultural exchange, friendship and further exchanges.
From ancient times till now, tourism has demonstrated the happy wish of the people for more knowledge, varied experiences and good health.
In ancient times, ancient Chinese thinkers raised the idea of "appreciating the landscape through sightseeing". Ancient people also proposed to "travel ten thousand li and read ten thousand books", and to travel over famous mountains and rivers. [解析]
旅游是一项集观光、娱乐、健身为一体的愉快的活动。旅游业随着时代进步而不断发展。
20世纪中叶以来，现代旅游在世界范围迅速兴起，旅游活动日益成为各国人民交流文化、增进友谊、扩大交往的重要桥梁。
古往今来，旅游一直是人们增长知识、丰富阅历、强健体魄的美好追求。
在古代，中国先哲们就提出了“观国之光”的思想，古人还倡导“读万卷书，行万里路”，游历名山大川。