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填空题
4500 synthetic chemicals can be classified as POPs.____
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解析：
由题干中“POPs”定位至E段。本段指出，有4,500种化学物质是最危险的种类，这些物质被称为“持久性污染物（POPs）”，故匹配段落为E段。
由题干中“POPs”定位至E段。本段指出，有4,500种化学物质是最危险的种类，这些物质被称为“持久性污染物（POPs）”，故匹配段落为E段。
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