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编辑点评： GRE写作想要获得高分，需要大家在作文语句的使用上，也要动足脑筋。所以，大家在平时的练习中，就要多多积累有用的词汇和句子，本文为大家整理总结了一些有用的句子，供大家参考。 本文的整理，主要帮助大家在GRE写作上积累足够的句子以及有用的词汇，大家在平时的练习中也可以多多运用它们。 71. Identifying the reasons for an emerging phenomenon which involves several complicated factors is far from an easy task. For example, some scientists attribute environmental deterioration to a series of natural factors, while others place the blame solely on inappropriate human behavior. 要找到涉及许多复杂因素的新现象的原因远非一件易事。例如，一些科学家把环境的恶化归结为一些自然因素，而另一些人把责任都推在人类不适当的行为上。 72. One doesn t have to look far to realize the direct correlation between smoking and cancer. 人们不用花费很大力气就能发现抽烟和癌症之间的直接联系。 73. The explanation for the phenomenon of the rising teenage suicide rate involves many complicated factors. Some attribute the rise to an overemphasis on early success, others point to mounting peer pressure, and still others to confusion over changing social values. | 
