第14题: [单项选择]Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen w the passage. The average number of women in each group is ______. A. 30 B. 27 C. 65 D. 35 参考答案:B 答案解析:[听力原文]18-20 Between 1987 and 1991, three groups of American women, numbering 27 in all, between