Laos has been fortunate in the development of its ecotourism because

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it has developed mass tourism and many tourism-related businesses since the early 1990s

tourists can make a constructive trip by following the simple guideline

it has had the right policies and then awareness from many tourism-related businesses

there are over 8000 species of birds and more than 1000 large mammals already identified

Giải thích

Chọn C

Dẫn chứng “Both the government and many tourism-related businesses took the message very seriously and acted on it.”