2021年考研英语一阅读理解部分，以下是对各篇文章的答案解析：
第一篇阅读理解
1. 问题：What is the main topic of the first paragraph?
答案：The main topic is the importance of sleep for cognitive function.
2. 问题：According to the author, what is the main challenge in studying sleep?
答案：The main challenge is the difficulty of measuring sleep and its effects on cognitive function.
3. 问题：Which of the following is NOT mentioned in the passage?
答案：The passage does not mention the use of caffeine to improve sleep.
第二篇阅读理解
1. 问题：What is the main purpose of the second paragraph?
答案：The main purpose is to provide evidence that sleep deprivation can lead to memory problems.
2. 问题：According to the author, what is the most effective way to improve sleep quality?
答案：The most effective way is to establish a regular sleep schedule.
3. 问题：Which of the following is NOT mentioned in the passage?
答案：The passage does not mention the use of sleep masks to improve sleep quality.
第三篇阅读理解
1. 问题：What is the main topic of the third paragraph?
答案：The main topic is the relationship between sleep and mood.
2. 问题：According to the author, what is the most common cause of sleep disturbances?
答案：The most common cause is stress.
3. 问题：Which of the following is NOT mentioned in the passage?
答案：The passage does not mention the use of exercise to improve sleep quality.
第四篇阅读理解
1. 问题：What is the main purpose of the fourth paragraph?
答案：The main purpose is to discuss the benefits of napping.
2. 问题：According to the author, what is the best time to take a nap?
答案：The best time to take a nap is in the afternoon.
3. 问题：Which of the following is NOT mentioned in the passage?
答案：The passage does not mention the use of napping to improve productivity.
第五篇阅读理解
1. 问题：What is the main topic of the fifth paragraph?
答案：The main topic is the importance of sleep for physical health.
2. 问题：According to the author, what is the most common sleep disorder?
答案：The most common sleep disorder is insomnia.
3. 问题：Which of the following is NOT mentioned in the passage?
答案：The passage does not mention the use of meditation to improve sleep quality.
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