单项选择题 Researchers have employed all of the following methods in researching potential explanations of the Anasazi evacuation EXCEPT（）

单项选择题 With which of the following statements concerning the condition of the Anasazi at the time of their evacuation would the author be most likely agree（）

单项选择题 It can be inferred from the passage that Van West notes the severe droughts which affected the Anasazi prior to the Great Drought primarily in order to（）