【题目】 The sum of all incomes in a country is called the________ ．

1、[单选题]The realization of one's desire to travel depends on many complex social and political factors, including the social _____ of the destination.

• A、change
• B、awareness
• C、policy
• D、stability

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2、[单选题]Local people usually see tourism as _______.

• A、an opportunity to make a profit
• B、an opportunity to create jobs
• C、a cultural and employment factor
• D、a wealth factor in the economy of their jurisdictions

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

• A、1970 
• B、1978 
• C、1980 
• D、1997

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5、[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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