第20题: [单项选择]Questions 26 to 28 are based on the passage you have just heard. A. The development goal of UNICEF. B. Cooperation among developing countries. C. Economic development and government efforts. D. People’s awareness of the importance of the problem. 参考答案:C 答案解析:[听力原文] What are the factors that lead to China’s success in reducing the rate 题目问是什么因素使得中国成功降