We do not know what fraction of visitors arriving at Bellegea came here for tourism.

　　Other factors could also account for the increase in per capita income in Bellegea.

　　The minister does not provide any information about details of ecotourism, thus the assumption that the natural environment of Paraterra will be preserved is not ensured.

　　The success of ecotourism in Bellegea, if any, may have no causal relationship with the directors effort.

　　Hiring the current director of Bellegeas National Tourism Office as a consultant may not be the best solution to ensure our success.

　　The minister fails to consider the possible cost of carrying out ecotourism.

　　注：题目中括号里的数字表明这句话体现的是提纲中第几号缺陷。

　　无论是gre issue还是gre argument，考生都应该养成写提纲的习惯。这种提纲式的gre写作练习可以帮助考生锻炼写作的逻辑性，而gre写作高分最重要的得分依据就是作文的逻辑性要强。

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