【題目】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難看到星星。

分析句子成分可知,本句缺少主語,由提示詞可知空處需要一個名詞作主語,pollute是動詞,其名詞形式是pollution,且不可數(shù)。故答案是pollution。

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