Questions 31 to 35 are based on the following passage.

　　“Humans should not try to avoid stress any more than they would shun food, love or exercise.” said Dr. Hans Selye, the first physician to document the effects of stress on the body. While here’s no question that continuous stress is harmful, several studies suggest that challenging situations in which you’re able to rise to the occasion can be good for you.

　　In a 2001 study of 158 hospital nurses, those who faced considerable work demands but coped with the challenge were more likely to say they were in good health than those who felt they couldn’t get the job done.

　　Stress that you can manage may also boost immune(免疫的) function. In a study at the Academic Center for Dentistry in Amsterdam, researchers put volunteers through two stressful experiences. In the first, a timed task that required memorizing a list followed by a short test, subjects believed they had control over the outcome. In the second, they weren’t in control: They had to sit through a gory(血淋淋的) video on surgical procedures. Those who did go on the memory test had an increase in levels of immunoglobulin A, an antibody that's the body’s first line of defense against germs. The video-watchers experienced a downturn in the antibody.

　　Stress prompts the body to produce certain stress hormones. In short bursts these hormones have a positive effect, including improved memory function. “They can help nerve cells handle information and put it into storage,” says Dr. Bruce McEwen of Rockefeller University in New York. But in the long run these hormones can have a harmful effect on the body and brain.

　　“Sustained stress is not good for you,” says Richard Morimoto, a researcher at Northwestern University in Illinois studying the effects of stress on longevity(長壽), “It’s the occasional burst of stress or brief exposure to stress that could be protective.”

　　原文出處

　　Healing Power of Stress

　　Some of those crazy, time-crunched days at the office may actually be good for you

　　“Man SHOULD NOT try to avoid stress than he would shun food, love or exercise," said Dr. HansSelye, the first physician to document the effects of stress on the body. While there's no question that prolonged stress is harmful, several studies suggest that challenging situations in which you’re able to rise to the occasion can be good for you.

　　In a 2001 study of 158 hospital nurses, those who faced considerable work demands but coped with the challenge were more likely to say they were in good health than those who felt they couldn’t get the job done.

　　Stress that you can manage may also boost immune function. In a study at the Academic Centre for Dentistry in Amsterdam, researchers put volunteers through two stressful experiences. In the first, a timed task that required memorizing a list followed by a short test, subjects believed they had control over the outcome. In the second, they weren't in control: They had to sit through a gory video on surgical procedures. Those who did go on the memory test had an increase in levels of immunoglobulin A, an antibody that's the body’s first line of defense against germs. The video-watchers experienced a downturn in the antibody.

　　Stress prompts the body to produce adrenaline and the stress hormonecortisol. In short bursts these hormones have a positive effect, including improved memory function. "Cortisol and adrenaline enhances how nerve cells handle information and put it into storage," says Bruce McEwen, head of the laboratory of neuron endocrinology at Rockefeller University. But over the long term these hormones can have a corrosive effect on the body and brain.

　　"Sustained stress is not good for you," says Richard Morimoto, a researcher at Northwestern University studying the effects of stress on longevity. "It's the occasional burst of stress or brief exposure to environmental or physiological stress that could be protective."

　　31. The passage is mainly about ______

　　{A) the benefits of manageable stress}

　　B) how to avoid stressful situations

　　C) how to cope with stress effectively

　　D) the effects of stress hormones on memory

　　32. The word “shun” (Line 1, Para.1) most probably means________.

　　A) cut down on

　　{B) stay away from}

　　C) run out of

　　D) put up with

　　33. We can conclude from the study of the 158 nurses in 2001 that _______

　　A) people under stress tend to have a poor memory

　　B) people who can’t get their job done experience more stress

　　{C) doing challenging work may be good for one’s health}

　　D) stress will weaken the body’s defense against germs

　　34. In the experiment described in Paragraph 3, the video-watchers experienced a downturn in the antibody because ______.

　　A) the video was not enjoyable at all

　　{B) the outcome was beyond their control }

　　C) they knew little about surgical procedures

　　D) they felt no pressure while watching the video

　　35. Dr. Bruce McEwen of Rockefeller University believes that ______.

　　A) a person’s memory is determined by the level of hormones in his body

　　B) stress hormones have lasting positive effects on the brain

　　{C) short bursts of stress hormones enhance memory function}

　　D) a person’s memory improves with continued experience of stress.