《2025年实验班全程提优训练高中英语选择性必修第二册外研版》

D
跨学科 Scientists are now digging into precisely why exercise holds so many benefits for our mental health and memory. The answer, studies say, lies in our brain chemistry.
Each time you work up a sweat your body releases feel-good happy hormones (荷尔蒙), including endorphins, dopamine and endocannabinoids, the latter being responsible for the so-called runner's high. Now researchers are also pointing to myokines(肌肉因子) as an important contributor to the mental health benefits of exercise. When our muscles contract, myokines are released into the bloodstream, helping our muscles and organs communicate. They think this communication increases resilience to stress, reduces symptoms of mental suffering and anxiety and has a direct effect on depression.
A 2021 scientific report published in Neuropharmacology showed evidence that myokines boost brain function, like improving memory and mood. “Myokines reduce systemic inflammation (炎症), which is especially beneficial for people with drug-resistant depression whose low mood is linked to high inflammation,” explains Dr Jennifer Heisz, an expert in brain health and associate professor in the department of kinesiology at McMaster University in Canada.
A recent study published in the British Journal of Sports Medicine showed that treatment for depression can be much more effective when physical activity is added to the usual care. Participants found benefits after 12 weeks of exercising for 30 to 60 minutes a day. “While exercise is not a replacement for professional mental health treatment, physical activity can complement and enhance the effects of the treatment,” says lead researcher Ben Singh, a research fellow at the University of South Australia.
“It is amazing to consider how moving our bodies can heal our minds,” says Heisz. Whether you're cycling, walking around your neighbourhood or doing yoga, getting sweaty is good for your body and mind. To get the biggest overall health boost, the key is to zero in on sports and activities you enjoy, so you'll keep going back to them.
32. How do myokines boost our mental health?
A. By bonding muscles with organs.
B. By slowing down our bloodstream.
C. By contracting muscles through the body.
D. By releasing happy hormones in our brain.
33. What is Ben Singh's attitude towards physical activity in treatment for depression?
A. Doubtful.
B. Negative.
C. Uncertain.
D. Approving.
34. 新考法 What does the underlined phrase “zero in on” in the last paragraph mean?
A. Adapt to.
B. Give up.
C. Focus on.
D. Put off.
35. 新考法 How does the author develop the text?
A. By making comparisons.
B. By presenting research findings.
C. By offering suggestions.
D. By conducting some experiments.

答案： 32.A 细节理解题。根据第二段最后两句可知，肌肉因子通过将肌肉与器官结合来促进我们的心理健康。故选 A。
33.D 推理判断题。根据第四段中 Ben Singh 说的话可推知，Ben Singh 认为体育活动可以补充和增强治疗抑郁效果，所以他对于治疗抑郁的体育活动的态度是赞同的。故选 D。
34.C 词义猜测题。根据文章最后一段画线短语的前后文可知，运动有助于我们的身心健康，所以要想获得最大程度的健康提升，关键是把注意力集中到自己喜欢的运动和活动上。由此可推知，画线短语的意思应为“集中注意力”，与 C 项 focus on(集中)意思相近。故选 C。
35.B 推理判断题。通读全文可知，文章前四段集中列举了研究结果，所以作者是通过列举研究结果的方式展开文章的。故选 B。