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21. 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 ______.(A) establish that enough food could have been grown to support the Anasazi's survival (B) affirm the notion that the Great Drought may have been exponentially more severe than prior droughts (C) suggest that the repetition of droughts was taking a cumulative toll on the fertility of the Plateau (D) argue that the Anasazi's past behavior would indicate their likely future behavior in the case of a Great Drought

22. Researchers have employed all of the following methods in researching potential explanations of the Anasazi evacuation EXCEPT______. (A) the study of modern Indian societies (B) the study of climatological records (C) the study of Anasazi mythology (D) the study of ceremonial structures

23. The author considers the explanations put forward by Van West and Adler for the causes of the Anasazi evacuation to be ______.(A) popular but suspect (B) premature and illogical (C) ambitious but misguided (D) partially persuasive but individually insufficient

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