51. What do we learn about publicity over protein in America?
- A. It has helped to create the myth of protein deficiency.
- B. It has helped Americans in search of protein-rich diets.
- C. It has raised a lot of health concerns among the public.
- D. It has been funded by food companies and health experts.
答案：A
答案句：But contrary to all the publicity that everyone needs more protein, most Americans get twice as much as they need. … Many of us living in the most developed countries are buying into a myth of protein deficiency created by food companies and self-identified health experts.
参考译文：但与所有关于每个人都需要更多蛋白质的宣传相反，大多数美国人摄入的蛋白质是他们所需的两倍。……我们许多生活在最发达国家的人正陷入由食品公司和自称的健康专家所制造的蛋白质缺乏的迷思中。
定位线索：题干“publicity over protein”→答案句“all the publicity that everyone needs more protein”；文中“myth of protein deficiency created by food companies”对应选项A“helped to create the myth of protein deficiency”。
解析：题干问关于美国蛋白质宣传我们了解到什么。答案句明确指出宣传声称人人需要更多蛋白质，但实际美国人摄入过量，且这种宣传制造了蛋白质缺乏的迷思。选项A“它帮助制造了蛋白质缺乏的迷思”正是对原文“buying into a myth of protein deficiency created by food companies”的同义转述。选项B偷换概念，原文说美国人在寻找高蛋白饮食，但宣传并非帮助这一行为；选项C无中生有，原文未提健康担忧；选项D偷换概念，原文说迷思由食品公司和健康专家创造，而非宣传由他们资助。
53. What should people take into consideration in deciding on the most preferable protein intake?
- A. How healthy they are and what food they eat.
- B. How old they are and what activities they do.
- C. How much protein they consume and what their body weight is.
- D. How serious their protein deficiency is and what remedies they use.
答案：B
答案句：In fact, Americans currently consume almost twice the National Academy of Medicine's recommended daily intake of protein although the most desirable protein intake may vary depending on age and activity level.
参考译文：事实上，美国人目前摄入的蛋白质几乎是国家医学院推荐每日摄入量的两倍，尽管最理想的蛋白质摄入量可能因年龄和活动水平而异。
定位线索：题干“most preferable protein intake”→答案句“the most desirable protein intake”；文中“depending on age and activity level”对应选项B“How old they are and what activities they do”。
解析：题干问决定最理想蛋白质摄入量应考虑什么。答案句明确指出“the most desirable protein intake may vary depending on age and activity level”，即取决于年龄和活动水平。选项B“他们多大年纪以及做什么活动”正是对“age and activity level”的同义转述。选项A无中生有，原文未提健康状况和食物种类；选项C偷换概念，原文未提体重；选项D无中生有，原文未提缺乏程度和补救措施。