第22题: [单项选择]What does the writer suggest about the study of smell in the atmosphere in paragraph E A. The measurement of smell is becoming more accurate. B. Researchers believe smell is a purely physical reaction. C. Most smells are inoffensive, D. Smell is yet to be defined. 参考答案:D 答案解析:[解析] 本题中paragraph E指出原文的位置,问作者的关于空气中气味的研究的suggest。第二句话but的后边表明了作者的观点:还有很多基础的问题需要回答。选项D中的yet to be de