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4.Run,swim,lift weights,do yoga-do something,because it's good for you.Many studies tell us that regular exercise not only helps our bodies but improves memory,and eases anxiety.But what is happening to the mind during workout to create all these benefits?
A new study from Sweden suggests that a specific protein found in trained muscles might contribute to exercise's mental benefits.This protein,the researchers found,might help our bodies process molecules that,if out of balance,can stress us and contribute to depression(萎靡不振).The findings were published in the journal Cell.
To test this,the researchers kept attacking some mice with flashing lights,loud noises and interrupting their sleep for weeks.Predictably,this treatment makes the mice show signs and biochemical markers of depression.
But not all the mice showed those signs.One group,specially raised to have high levels of a protein called PGC-1alpha1 (the one in trained muscles),did not show those depression signs.PGC-1alpha1 increases production of an enzyme that breaks down a chemical called kynurenine.Kynurenine helps the body respond to an activated immune system(活性免疫系统),but it also plays a role in depression.
"Our original research assumption was that trained muscle would produce a substance(物质) with beneficial effects on the brain,"Jorge Ruas of the Karolinska Institute told Forbes.com."We actually found the opposite:well-trained muscle produces an enzyme that removes harmful substances away from the body."
This study was in mice,but it lines up nicely with all the other lines of evidence that exercise is good for mental health.

32.According to the study,which of the following is bad for your mental healthD?
A.Protein.  
B.Molecule. 
C.Enzyme. 
D.Kynurenine
33.What conclusion have the researchers drawn from the studyD?
A.Unbalanced exercise leads you to depression.
B.Well-fed mice survive better though being ill-treated.
C.Trained muscle produces a substance good for brain.
D.Regular exercise helps to clear rubbish away from body.
34.According to the last paragraph,the result of the study isA.
A.reliable
B.doubtful
C.predictable
D.ambiguous
35.What's the main idea of the passageC?
A.Why do you need regular exercise?
B.What matters most for your body?
C.How does exercise help your brain?
D.Why are mice chosen for the study?

分析 本文讲述了一项新的研究,经常锻炼不仅可以帮助我们的身体,而且可以改善记忆,锻炼能够减少焦虑.文章也详细的写出锻炼有这些好处的原因.

解答 32.D.细节理解题.根据第二段中的"A new study from Sweden suggests that a specific protein found in trained muscles might contribute to exercise's mental benefits."可知,蛋白质对身体有好处,排除A;根据第二段中的"This protein,the researchers found,might help our bodies process molecules that,if out of balance,can stress us and contribute to depression"可知,molecule失去平衡对身体不好,排除B;根据倒数第二段中的"well-trained muscle produces an enzyme that removes harmful substances away from the body",可知,酶能帮助我们排除体内垃圾,排除C;根据第四段中的"Kynurenine helps the body respond to an activated immune system,but it also plays a role in depression"可知,3-氨茴酰丙氨酸会引起人情绪低落.故选D.
33.D.细节理解题.根据倒数第二段中的"well-trained muscle produces an enzyme that removes harmful substances away from the body",可知,锻炼中产生的某些酶能帮助我们排除体内垃圾.故选D.
34.A.推理判断题.根据最后一段中的"but it lines up nicely with all the other lines of evidence that exercise is good for mental health",可知研究的结果是可靠的.故选A.
35.C.主旨大意题.文章讲述了一项新的研究,经常锻炼不仅可以帮助我们的身体,而且可以改善记忆,锻炼能够减少焦虑,而文章下文也进一步写出了其中的原因.故选C.

点评 本文是健康环保类阅读,考查学生的细节理解和推理判断能力.做细节理解题时一定要找到文章中的原句,和题干进行比较,再做出正确选择.在做推理判断题时不要以个人的主观想象代替文章的事实,要根据文章事实进行合乎逻辑的推理判断.

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