[单选题] As in any business，there must be one person called ________who is highly trained，capable of directing a complex successful hotel．

1、[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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2、[单选题]As the domestic tourism industry ____,competition will become increasingly ____.

• A、grows, intent
• B、develops, intent
• C、matures, intense
• D、strengthens, intense

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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]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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5、[单选题]The removal of coral, either for souvenirs collected by the public or for commercial sale by tourist enterprises, ______ some coastal regions of Australia and elsewhere.

• A、develops
• B、threatens
• C、promotes
• D、improves

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