题目

—The air is very fresh in our city. There is less ___________ than before. —Yes. The government has taken action to protect the environment. A. wood            B. pollution        C. noise           D. water 答案：B 【解析】A. wood 树木；B. pollution污染；C. noise 噪音；D. water水，根据The government has taken action to protect the environment可知句意：我们城市的空气很新鲜. 污染比以前少了。故选B。

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