46. What do we learn about followers of the positive stress movement?
- A. They are usually quite sensitive to different types of stress.
- B. They hold a different view on stress from the popular one.
- C. They derive much pleasure from living a very hectic life.
- D. They gain a competitive edge by enjoying good health.
答案：B
答案句：People often discuss the dangers of too much stress, but lately a very different view of stress is gaining popularity: this view of stress, held by members of the positive stress movement, argues that stress might actually be beneficial.
参考译文：人们经常讨论压力过大的危险，但最近一种非常不同的压力观正在流行：这种由积极压力运动成员持有的观点认为，压力实际上可能是有益的。
定位线索：题干“followers of the positive stress movement”→答案句“members of the positive stress movement”；文中“a very different view of stress”对应选项B“a different view on stress”。
解析：题干问积极压力运动的追随者的情况。答案句明确指出该运动成员持有“a very different view of stress”，即与主流观点不同的压力观，与选项B“They hold a different view on stress from the popular one”直接对应。选项A“对不同类型的压力敏感”、C“从忙碌生活中获得乐趣”、D“通过健康获得竞争优势”在原文中均无依据，属于无中生有。
49. What can be inferred from the passage about day-to-day stress?
- A. It is harmful to one's physical and mental health.
- B. It does not differ in essence from positive stress.
- C. It is something everybody has to live with.
- D. It does not help build up one's tolerance.
答案：D
答案句：For him, the difference between day-to-day stress, like the kind we feel when moving apartments, and positive stress is that the latter involves pushing the body to extremes and forcing it to build up a tolerance.
参考译文：对他来说，日常压力（比如搬家时感受到的那种）和积极压力之间的区别在于，后者涉及将身体推向极限并迫使它建立耐受性。
定位线索：题干“day-to-day stress”→答案句“day-to-day stress”；文中“the latter involves pushing the body to extremes and forcing it to build up a tolerance”暗示日常压力不涉及建立耐受性，对应选项D“It does not help build up one's tolerance”。
解析：题干要求推断关于日常压力的信息。答案句对比了日常压力和积极压力，指出积极压力“involves pushing the body to extremes and forcing it to build up a tolerance”，由此可推断日常压力不涉及建立耐受性，与选项D“It does not help build up one's tolerance”一致。选项A“对身心健康有害”、C“每个人都必须忍受”在原文中未提及；选项B“与积极压力本质相同”与原文明确区分两者相矛盾，属于偷换概念。
50. What do some medical professionals think of positive stress?
- A. Its true effect remains to be verified.
- B. Its side effect should not be ignored.
- C. Its effect varies considerably from person to person.
- D. Its practitioners should not take it as a form of therapy.
答案：B
答案句：But it is important to note that not everyone agrees with these practitioners; indeed, some medical professionals argue that positive stress is not for everyone, and that it might even be dangerous for people who are unhealthy or older.
参考译文：但重要的是要注意，并非所有人都同意这些实践者的观点；事实上，一些医学专业人士认为积极压力并不适合所有人，对不健康或年长的人来说甚至可能是危险的。
定位线索：题干“some medical professionals think of positive stress”→答案句“some medical professionals argue that positive stress is not for everyone, and that it might even be dangerous”；文中“dangerous”对应选项B“side effect”。
解析：题干问一些医学专业人士对积极压力的看法。答案句明确说他们认为积极压力“might even be dangerous for people who are unhealthy or older”，即可能有危险，与选项B“Its side effect should not be ignored”对应。选项A“真实效果有待验证”、C“效果因人而异”在原文中未提及；选项D“实践者不应将其视为疗法”过度推断，原文只说对某些人危险，并非完全否定，属于程度过重。