There are many small things we can do to reduce the (pollute) ______ of the environment.

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问题 There are many small things we can do to reduce the (pollute) ______ of the environment.

选项

答案pollution

解析 根据句子结构,这里需要一个名词作动词reduce 的宾语,pollute 的名词形式为pollution,意为“污染”。
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