52. The “so-called fight-or-flight response” (Line 2, Para. 1) refers to “________”.

　　A) the biological process in which human beings’ sense of self-defense evolves

　　B) the instinctive fear human beings feel when faced with potential danger

　　C) the act of evaluating a dangerous situation and making a quick decision

　　D) the elaborate mechanism in the human brain for retrieving information

　　53. From the studies conducted by LeDoux we learn that ________.

　　A) reactions of humans and animals to dangerous situations are often unpredictable

　　B) memories of significant events enable people to control fear and distress

　　C) people’s unpleasant memories are derived from their feeling of fear

　　D) the amygdale plays a vital part in human and animal responses to potential danger

　　54. From the passage we know that ________.

　　A) a little worry will do us good if handled properly

　　B) a little worry will enable us to survive a recession

　　C) fear strengthens the human desire to survive danger

　　D) fear helps people to anticipate certain future events

　　55. Which of the following is the best way to deal with your worries according to Hallowell?

　　A) Ask for help from the people around you.

　　B) Use the belt-tightening strategies for survival.

　　C) Seek professional advice and take action.

　　D) Understand the situation and be fully prepared.

　　56. In Hallowell’s view, people’s reaction to the terrorist threat last fall was ________.

　　A) ridiculous

　　B) understandable

　　C) over-cautious

　　D) sensible