Polluted air can do great harm to our health．题目和参考答案——青夏教育精英家教网—

20．Polluted air can do great harm to our health．

分析被污染的空气对我们的健康是很有害处的．

解答答案：Polluted．
根据句子的谓语宾语内容do great harm to our health可知，前面的名词air应该缺少一个形容词，表示不好的空气，结合首字母和句意可知应该使用过去分词（polluted受到污染的）作定语，修饰名词air．故答案为Polluted．

点评首字母填空题考查的是词汇的记忆和运用能力，平时要注意积累和运用．同时还要注意提示字母．

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