A main purpose of the passage is to
A. chronicle the evolution of Nahua survivalist strategies from the year 1521 onward
B. critically evaluate the means of Nahua survival on the basis of their efficacy
C. suggest that Nahua interacted with their conquerors to create new technologies
D. explore the rich cultural heritage endowed the Nahua by their tradition of survival
E. apply a general schema for cultural survival to the case of the Nahua
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According to the passage, initial improvement in brain function in Homo's ancestors resulted at least partially from which of the following
A. the sharing of resources typical of hunter-gatherer groups to which Homo eventually came to belong
B. the freeing of Homo's heat-sensitive brain from the temperature constraints that had kept its size in check
C. the availability of foods far denser in calories and nutrients than those previously available
D. a rise in Homo's brain weight relative to his body weight
E. morphological solutions of environmental change developed by the robust proto-humans
DISPOSED:
A. averse
B. ridiculed
C. interrupted
D. resolute
E. disheartened
It can be inferred from the passage that chimpanzees are characterized by
A. brains that use less overall body energy than the percentage humans use
B. the posession of less total body weight than the average human weight
C. a total resting energy equal to that of human resting energy
D. a diet completely devoid of rich foods preferred by more developed species
E. a higher ratio of brain weight to body weight
随着每单位可变投入的增加，当（）时，报酬递减规律发生作用。
A. 总产出开始下降
B. 边际物质产品变为负数
C. 边际物质产出开始下降
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