[单选题] Ecotourism is one of the most rapidly growing form of specialized travel in the West，with central American countries，such as Costa Rica，________the principal destinations at present．

1、[单选题]________is the most widely recognized international organizations in tourism today．

• A、International ivil viation Organization
• B、International Hotel ssociation
• C、World ssociation of Travel gencies
• D、World Tourism Organization

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2、[单选题]The WTO has suggested several ______ for domestic tourism definitions.

• A、guidelines
• B、principles
• C、policies
• D、facilities

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3、[单选题]Charter services do not operate according to _____.

• A、middleman's orders
• B、charted routes
• C、agreed practices
• D、published timetables

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4、[单选题]Ecotourism is one of the most rapidly growing form of specialized travel in the West，with central American countries，such as Costa Rica，________the principal destinations at present．

• A、be 
• B、to be 
• C、being  
• D、been

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5、[单选题]In 1981 the WTO has urged national tourism organizations ______ foreign nationals in their country as domestic travelers.

• A、to include
• B、included
• C、not to include
• D、including

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