第11题: [单项选择]Questions 29 to 31 are based on the passage you have just heard. A. By using satellite images, maps, etc. B. By studying specific farming methods. C. By studying the variation of human population. D. By analyzing the quality of crops. 参考答案:A 答案解析:[听力原文] How can the group carry out their studies [答案解析] 细节题。原文中关于研究方法的句子是:The groups used sat