47. What does the author say about the proteins in our body?
- A. They can modify the effects of medicines in different ways.
- B. They can reduce unwanted side effects of certain medicines.
- C. Their reaction to medicines changes during the day-night cycle.
- D. Their design determines how differently they react to medicines.
答案：C
答案句：Many drug targets in the body follow a 24-hour cycle, too. This means that the specific proteins a drug is designed to modify can react differently to the medicine over the course of a 24-hour time period.
参考译文：体内的许多药物靶点也遵循24小时周期。这意味着药物设计要修饰的特定蛋白质在24小时的时间过程中对药物的反应可能不同。
定位线索：题干“the proteins in our body”→答案句“the specific proteins a drug is designed to modify”；文中“react differently to the medicine over the course of a 24-hour time period”对应选项C“Their reaction to medicines changes during the day-night cycle”。
解析：答案句直接说明蛋白质在24小时周期内对药物反应不同，选项C“changes during the day-night cycle”是原文“react differently...over the course of a 24-hour time period”的同义改写。选项A“modify the effects”偷换概念，蛋白质是被修饰对象而非修饰者；选项B“reduce unwanted side effects”答非所问，原文未提蛋白质减少副作用；选项D“Their design determines”无中生有，原文未提设计决定反应。
50. What does the author suggest near the end of the passage?
- A. Considering drug-taking timing when prescribing drugs for patients.
- B. Making treatments less complex by taking drug timing into account.
- C. Conducting more studies to find out the best timing for treating different diseases.
- D. Finding out the most effective drugs for treating diseases through further research.
答案：C
答案句：More research is needed to determine the best times to administer treatments for different diseases. I believe taking drug timing into account could help make treatments more effective and help more people worldwide.
参考译文：需要更多的研究来确定不同疾病治疗的最佳时间。我相信考虑服药时间有助于使治疗更有效，并帮助全世界更多的人。
定位线索：题干“near the end of the passage”→答案句取自末段“More research is needed to determine the best times to administer treatments for different diseases”；文中“More research is needed”对应选项C“Conducting more studies”。
解析：末段第一句明确建议“More research is needed to determine the best times”，选项C“Conducting more studies to find out the best timing for treating different diseases”是对此的同义转述。选项A“Considering drug-taking timing when prescribing”是作者个人信念，但题干问“suggest”，且原文强调“more research”；选项B“making treatments less complex”无中生有，原文未提简化；选项D“finding out the most effective drugs”偷换概念，原文是“best times”而非“most effective drugs”。