本书从内容到形式完全按照新大纲组织，在题型上，既有数字、句子听写、正误听析、问答，又包括对话、短文、复合听写，问题设计完全依据考试题型，极具针对性和指导性。本书选材新颖、体裁多样、涉及面广、语言生动，融知识性、趣味性、可读性为一体，让读者在轻松的阅读中领会考点要领，并契合了新大纲培养学生综合素质的要求。本书不但能直接帮助和指导应试者顺利通过六级考试，同时也可对各类英语考试（如托福、研究生入学考试等）的考生提供参考和帮助。

Unit One

Key to Unit One

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Unit Two

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Unit Three

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Unit Four

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Unit Five

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Unit Six

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Unit Seven

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Unit Eight

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But even if every city reused its water, we still would not have enough. All we'd have to do is to make use of the seawater in the world. If we take these steps, we'll be in no danger of drying up.