段2：①Snap decisions can be important defense mechanisms; if we are judging whether someone is dangerous, our brains and bodies are hard-wired to react very quickly, within milliseconds. ②But we need more time to assess other factors. ③To accurately tell whether someone is sociable, studies show, we need at least a minute, preferably five. ④It takes a while to judge complex aspects of personality, like neuroticism or open-mindedness.
31. The time needed in making decisions may .
[A] predetermine the accuracy of our judgment
[B] prove the complexity of our brain reaction
[C] depend on the importance of the assessment
[D] vary according to the urgency of the situation
答案：D
问：根据原文中的哪几句话可以得出31题的正确答案？（多选题）
A : 段2句①
B : 段2句②
C : 段2句③
D : 段2句④
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