[单项选择]{{B}}Passage One
Questions 11 to 13 are based on the following passage:{{/B}} 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 the r studies
[试题分析] 细节考察题。
[详细解答] 相关句子:“The groups used sa