C
Teenagers have long been told that being active and taking part in various sports is good for their health. But new research suggests that too much sport for teenagers could negatively affect their well-being just as much as too little sport.
Researchers from Switzerland say their study suggests that 14 hours of physical activity a week is best for promoting good health in teenagers. However, they found that more than 14 hours appears to be detrimental to their health. To reach their findings, the researchers surveyed more than 1,245 teenagers aged between 16 and 20 from Switzerland.
All participants were required to answer questions on height and weight, sports practice, sports injuries and well-being. Their well-being was assessed(评估) using the World Health Organization (WHO) Well-Being Index, and the average well-being score for all participants was 17.
The researchers divided sports participation into low (0－3.5 hours a week), average (3.6－10.5 hours), high (10.6－17.5 hours), and very high (more than 17.5 hours). The researchers found that participants in the low and very high activity groups were more than twice as likely to have well-being scores below 13, compared with participants in the average group. The researchers found that the highest well-being scores were gotten by participants who carried out around 14 hours of physical activity a week, but exercising beyond 14 hours resulted in lower well-being scores.
Commenting on their findings, the researchers say physical activity has been connected with positive emotional well-being, reduced sadness, anxiety and stress disorders, and improved self-respect in teenagers.
The researchers suggest that their study stresses the importance for physicians caring for teenagers to check their level of sports practice and ask them about their well-being. Teenagers probably need a supportive and closer follow-up of their health and well-being. The findings can provide information for guideline groups who produce recommendations on sports practice for teenagers.
()8. What does the underlined word "detrimental" in paragraph 2 mean?
A. Normal. B. Helpful. C. Harmful. D. Necessary.
()9. What is paragraph 4 mainly about concerning the study?
A. Its impact. B. Its findings. C. Its limitations. D. Its application.
()10. We can infer from the passage .
A. researchers are planning a follow-up study
B. guideline groups have set new rules for teenagers
C. how much teens exercise matters for their well-being
D. physicians should recommend sports practice for teens
()11. Where is this text probably taken from?
A. A storybook. B. A fitness diary. C. A sports magazine. D. A fashion newspaper.
D

8.C 9.B 10.C 11.C
【语篇解读】本文是一篇说明文。一项瑞士研究表明，青少年每周14小时的体育活动最有益健康，运动过量(超过14小时)或过少均会对其健康产生负面影响。
8. C 解析:词义猜测题。画线词上文“Researchers from Switzerland say their study suggests that 14 hours of physical activity a week is best for promoting good health in teenagers.”提到每周14小时体育活动对青少年健康最有益，画线词所在句用“However”表示转折，说明超过14小时会带来相反效果，且下文的研究数据也阐明了这一点。由此可推知，detrimental意为“有害的；不利的”。故选C。
9. B 解析:段落大意题。根据第四段中“The researchers found that... in lower well-being scores.(研究人员发现，低活动量组和极高活动量组的参与者，其幸福感得分低于13分的比例是平均水平组的两倍多。研究人员还发现，每周进行约14小时体育活动的参与者幸福感得分最高，但超过14小时的锻炼会导致幸福感得分降低)”可知，该段主要介绍了该研究的具体发现，包括不同运动时长分组与青少年幸福感得分之间的关系。故选B。
10. C 解析:推理判断题。根据第四段中“The researchers found that participants in the low and very high activity groups were more than twice as likely to have well-being scores below 13, compared with participants in the average group.”可知，青少年运动量过多或过少都会降低幸福感。由此推断，青少年运动量的多少对其幸福感有重要影响。故选C。
11. C 解析:文章出处题。通读全文，尤其是根据第一段中“But new research suggests that too much sport for teenagers could negatively affect their well-being just as much as too little sport.”可知，本文介绍了一项关于青少年运动时长与幸福感关系的科学研究，并讨论了其对医学指导和健康建议的潜在意义。文章聚焦于运动、健康与研究，很可能选自一本体育杂志。故选C。