第1题:
21. What’s the most likely the topic of this talk?
【解析】从短文录音的第一句便可知道答案：Woman may be more susceptible to the lung damaging effect to smoking than men。因此本题答案为D。
第2题:
22. How many subjects did Dr. Soerheim recruit in the study?
【解析】根据录音中..including 954 subjects with chronic obstructive pulmonary disease (COPD) and 955 controls可知，总共招录的实验对象（subjects)）为954+955=1909，故本题答案为C。
第3题:
23. When and where was Dr. Soerheim present their study results?
【解析】根据录音中的..May 18, at the 115 international conference of American directive society in Santiago，可知本题的答案为A。
第4题:
24. According to the talk, when is the gender difference most likely to be obvious in COPD susceptibility?
【解析】从录音中“But this gender reset was most pronounced women’s level of smoking exposure was low”可知，当smoking exposure较低时，性别差异最明显。
第5题:
25. Which of the following is not an explanation for women’s great susceptibility to the effects of smoking?
【解析】从录音最后“Women have small airways, therefore eat cigarettes may do more harm. Also there are gender differences in the metabolism of cigarette smoke, genes and hormones could also be important.”可知，男女的新陈代谢和荷尔蒙差异、女性狭窄的气道都是让女性更容易受到吸烟后果影响的因素，但其中并未说女性比男性的新陈代谢更活跃，因此C正确。
原文：
(21) Women may be more susceptible to the lung-damaging effects to smoking than men, according to new research by Inga-Cecilie Soerheim, M.D., and her colleagues from Channing Laboratory, Brigham and Women's Hospital and University of Bergen Norway. (22) They analyzed the data from the Norwegian case-control study, including 954 subjects with chronic obstructive pulmonary disease (COPD慢性阻塞性肺疾病)and 955 controls, all were current or ex-smokers. And the COPD subject had moderate or severe COPD. Overall our analysis indicated that women may be more vulnerable to the effects of smoking, which is something previously suspected but not proven, said Dr. Soerheim. (23) The study results will be presented on May 18, at the 105th international conference of the American Thoracic society in San Diego. Examining the total study sample, there were no gender differences with respect to lung function (FEV1) and COPD severity, but the women were on average younger and had smoked significantly less than men.
To explore these differences further; they also analyzed two subgroups of the study sample: COPD subjects under the age of 60 (early onset group) and COPD subjects with less than 20 pack years of smoking (low exposure group). In both subgroups, women had more severe disease and greater impairment of lung function than men.
“This means that female smokers in our study experienced reduced lung function at a lower level of smoking exposure and at an earlier age than men," said Dr. Soerheim.
It has long been suspected that the effect of smoking on lung function may be modified by gender. Interaction analysis confirmed that being female represents a higher risk of reduced lung function and severe COPD, (24) but this gender effect of was most pronounced when the level of smoking exposure was low.The gender difference in COPD susceptibility seems to be most important when smoking exposure is low. Women may tolerate small amounts of tobacco worse than men,” Dr. Soerheim explained.
According to Dr. Soerheim, the reason why women may be more susceptible to the effects of cigarette smoke is still unknown, but there are several possible explanations: (25) “Women have smaller airways, therefore each cigarettes may do more harm. Also there are gender differences in the metabolism of cigarette smoke, genes and hormones could also be important.”
