Clean water and fresh air are essential for our daily life. . 干净的水和新鲜空气是我们的日常生活所必需的.没有它们.我们就不能生存. 题目和参考答案——青夏教育精英家教网—

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9. Clean water and fresh air are essential for our daily life， . (without)

干净的水和新鲜空气是我们的日常生活所必需的，没有它们，我们就不能生存。

9. without which / and without them we can't live 考查"介词+关系代词"结构的应用。"没有它们，我们就不能生存"是对前面叙述的补充说明，所以用非限定性定语从句；which代表"clean water and fresh air"

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