In the opening paragraph, the author introduces his topic by ______. Dr. Brosnan and Dr. de Waal have eventually found in their

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问题 In the opening paragraph, the author introduces his topic by ______.
Dr. Brosnan and Dr. de Waal have eventually found in their study that the monkeys ______.

选项 A、prefer grapes to cucumbers
B、can be taught to exchange things
C、will not be co-operative if feeling cheated
D、are unhappy when separated from others

答案C

解析 细节题。根据问题中的线索词"eventually"可以确定这道题所对应的出题句可能在最后一段。事实上,它对应的是末段第二句"Such co-operation is likely to be stable only when each animal feels it is not being cheated",答案选项说到的正好是这个意思。
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