单项选择题
A．We can find some ways to avoid stress. B．Stress is always harmful to people. C．It is easy to change the habit of keeping oneself busy with work. D．Different people can withstand different amount of stress..
A．asking a choice between "flight or fight" B．"reaction to stress both chemically and physically" C．"responding to crises quickly" D．"losing heart at the signs of difficulties"
A．they do not know how to enjoy themselves B．they do not believe that relaxation is important for health C．they are traveling fast all the time D．they are becoming busier with their work