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　　● 题目：

　　One form of pollution –the release of greenhouse gases that causes global warming –does appear to be a phenomenon that is going to extend well into our future, but its total impact is unlikely to pose a devastating problem.(剑5, Test 1 passage 3)

　　● 分析：

　　本句为并列句，“One form of pollution does appear to be a phenomenon”和“but its total impact is unlikely to pose a devastating problem”并列，由but连接;破折号中内容为解释说明部分，解释One form of pollution;“that is going to extend well into our future”为定语从句，做a phenomenon的定语，关系词为that。