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　　● 题目：

　　To archaeology, which studies all cultures and periods, whether with or without writing, the distinction between history and pre-history is a convenient dividing line that recognizes the importance of the written word, but in no way lessens the importance of the importance of the useful information contained in oral histories. (剑4, test4 passage 2)

　　● 分析：

　　本句较长，主句为“the distinction between history and pre-history is a convenient dividing line”;“which studies all cultures and periods, whether with or without writing”为定语从句，做archaeology的定语，关系词为which;“that recognizes the importance of the written word, but in no way lessens the importance of the importance of the useful information”也是定语从句，做dividing line的定语，关系词为that;“contained in oral histories”为过去分词短语作定语，限定useful information。