你打开了飞翔的小鱼第 36 篇文章
Topic: the Science of our Bodies
难度等级：（对应校内7年级）
建议完成时间：4分钟
What do you usually do when you are thinking h_____1_____? Many of us will scratch（挠）our heads when we’re thinking about something. But do you know w_____2_____ we do this?
Some people think this is a kind of n_____3_____ behavior that we got from our ancestors（袓先）. But o_____4_____ think it might be a way to control our a_____5_____. When we come across a hard problem, we may feel angry or upset. But our brain tells us that we must control our feelings. So, we choose to do something else i_____6_____. We scratch our head rather than become angry, Live Science reported.
Scratching our heads probably also s_____7_____ that we are stressed out. When we are suffering from great stress, our brain might tell us to touch ourselves in some way, s_____8_____ as touching our head or face, according to Psychology Today.
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