读表，回答问题。
（1）四种模式中，旅游业发展条件最优越的是_________。
（2）分析模式2旅游业发展的优势与劣势。
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（3）分析模式3发展旅游业比较困难的原因。
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（4）分析模式4发展旅游业应采取哪些措施？
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