[单选题] WTO is _____ that represents all national and official tourist interests.

1、[单选题]For the limited-capacity tour programs, the use of _____ is a convenient way to reduce cost

• A、shell folders
• B、umbrella brochures
• C、regular tour brochures
• D、booklets

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2、[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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3、[单选题]Resources are a fundamental _______ in the development of tourism.

• A、comparison
• B、composition
• C、compliment
• D、component

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4、[单选题]_______ came into service in the early 1980s.

• A、The comet
• B、The oeing 747
• C、The oeing 757
• D、The oeing 767

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5、[单选题]Airlines will________ to allow for the high number of________ ，but must exercise caution．

• A、overbook, independent travelers 
• B、overbook, no-shows
• C、underbook，business travelers 
• D、underbook，repeat travelers

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