2. 外语
  3. Anxiety is a normal response to physical danger, so it is very useful and very popular among people. A rat can learn and form n

Anxiety is a normal response to physical danger, so it is very useful and very popular among people. A rat can learn and form n

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问题 Anxiety is a normal response to physical danger, so it is very useful and very popular among people.
A rat can learn and form new memories in its brain under the effect of
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答案the hippocampus
解析 定位到第十段第二、四句，可知是the hippocampus使老鼠形成新记忆，避免未来的危险。
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大学英语六级

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