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【题目】Light________ (pollute) in big cities makes it difficult to see the stars at night.

【答案】pollution

【解析】

句意:大城市的光污染使夜晚很难看到星星。

分析句子成分可知,本句缺少主语,由提示词可知空处需要一个名词作主语,pollute是动词,其名词形式是pollution,且不可数。故答案是pollution

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