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1. Evaluation: D
P1: For presentation of a grey token, the chimpanzee who presented it got one grape; while presentation of red token brought two grapes; one grape for that chimpanzee and another grape for an unfamiliar chimpanzee visible through a screen.
P2: The chimpanzees usually choose the red tokens
C: chimpanzees of that species are motivated by the desire to help other chimpanzees as well as themselves
D 研究那个颜色是黑猩猩喜欢的颜色, 如果喜欢红色, 则排除了结论的可能性。
2. D
P: Oriole Airlines plans to offer a $25 discount to anyone who books a flight directly through the airline's Web site
C: Strategy will increase net profits、
D 和原题的计划无关, 喜欢使用独立网站订票的人无法改变计划中利润的升降。 而B选项 如果独立网站时最低的价格, 那么就会选择独立网站而放弃官网, 如果官网打完折后更便宜, 那么则无法增加利润
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