In the opening paragraph, the author introduces his topic by ______. What can we infer from the last paragraph?

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问题 In the opening paragraph, the author introduces his topic by ______.
What can we infer from the last paragraph?

选项 A、Monkeys can be trained to develop social emotions.
B、Human indignation evolved from an uncertain source.
C、Animals usually show their feelings openly as humans do.
D、Cooperation among monkeys remains stable only in the wild.

答案B

解析 事实细节题。可根据文章最后一段的最后一句话得到答案。
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