参考答案：C

解析：

译文：我们对于陌生人的第一印象取决于他或她的_________?

We all have first impression of someone we just met. But why? Why do we form an opinion about someone without really knowing anything about him or her - aside perhaps from a few remarks or readily observable traits?

The answer is related to how your brain allows you to be aware of the world. Your brain is so sensitive in picking up facial traits.（面部特征） Even very minor difference in how a person’s eyes, ears, nose, or mouth are placed in relation to each other makes you see him or her as different.

本题比较简便的方法是：通过行文顺序原则，首先确定是开头的段落，按照比例原则，选项是短语，阅读量较小，因此通过选项给出的信息去筛选，可以发现C.facial features.（面部特征）最为符合原文的说法，并且文中还举出具体的例子eyes, ears, nose, or mouth，因此C选项最为合适。

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