What has caused the pollution problem? The underlined word "it" in the fourth paragraph refers to ______.

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问题 What has caused the pollution problem?
The underlined word "it" in the fourth paragraph refers to ______.

选项 A、a selling point
B、the company name
C、a great demand for health foods
D、the manufacturing of green products

答案D

解析通过对句子成分的分析得出，it指代的是“they have made the manufacturing of clean and safe”，即产品是“绿色”的。

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公共英语二级笔试

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