4. The extreme crises people met in more primitive days are the choices between _____.

　　A) life and death

　　B) chemical reaction and physical reaction

　　C) fight and flight

　　D) short-term reaction and long-term reaction

　　5. Which of the following is implied but NOT stated directly by the author?

　　A) Intelligent people can deal with large amounts of stress.

　　B) Stress will bring harm to health when it lasts long-time and gets out of control.

　　C) Stress in life cannot be eliminated, but utilized appropriately can enhanced life.

　　D) People are finding less time for relaxation because they are occupied with their routine businesses.

　　CADAC