2. 外语
  3. Original usage refers to rivers that ______ . Entering rivers by ______ , phosphates and nitrates as fertilizers can result in

Original usage refers to rivers that ______ . Entering rivers by ______ , phosphates and nitrates as fertilizers can result in

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问题 Original usage refers to rivers that ______ .
Entering rivers by ______ , phosphates and nitrates as fertilizers can result in eutrophication.
选项
答案rainwater runoff and groundwater seepage
解析 该段第一句指出用磷酸盐和硝酸盐做肥料能够引起其他问题。第二句就举例说明了所导致的问题。该句中的Entering rivers via rainwater runoff and groundwater seepage, these chemicals can cause eutrophication直接给了导致超营养作用的是Entering rivers via rainwater runoff and groundwater seepage，其中by=via。
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大学英语六级

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