Your teacher asks you to go into the class.“Here it comes，” you think. But what you hear is: “Well done. Your test was excellent.” You can hardly believe your ears.

　　Our fight or flight response is designed to protect us from tigers that would have once hidden in the woods around us, threatening our survival. At times when our survival is threatened, there is no greater response to have on our side.When activated, the response causes stress hormones (荷尔蒙) to pump through our body.

　　When we face very real dangers to our survival, it is invaluable. However, few of the “tigers” we face in our lives pose (造成) a serious physical threat to our existence.They cause us no end of stress, triggering (引发) the full activation of our fight or flight response. They tend to cause us to overreact to the situation in a counterproductive way. It is counterproductive to hit someone (the fight response) or run away (the flight response).

　　By recognizing the symptoms，we can begin to take steps to handle the stress overload. By learning to recognize the signals of fight or flight activation, we can avoid reacting excessively (过度地) to events and fears that are not life threatening. In so doing, we use this extra energy to help us, borrowing the beneficial effects in order to change our emotional environment and deal productively with our fears, thoughts and potential dangers.

　　语篇解读：本文是一篇说明文。文章介绍了人类的应激反应。

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