A-A+
People also react very differently to exposure
问题详情
People also react very differently to exposure to indoor air pollutants. Further research is 9 to请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：
【解析】选[N]。空前的is表明此处应填一形容词或动词的过去分词。此句是说，要更好地了解在接触普通的空气污染物后对身体有哪些影响，这需要进一步的研究，[N]needed符合语义。
