【题目】 Since China opened to the outside world in ________，the number of hotels has increased considerably．

1、[单选题]The sum of all incomes in a country is called the________ ．

• A、economic income
• B、productive income
• C、financial income
• D、national income

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2、[单选题]Standardization and rigidity are very clear characteristics of ____ tours offered on al arge scale.

• A、international
• B、in-bound
• C、package
• D、business

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3、[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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4、[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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5、[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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