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(活性免疫系統(tǒng)),but it also plays a role in depression.
"Our original research assumption was that trained muscle would produce a substance(物質) 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.a(chǎn)mbiguous
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 本文講述了一項新的研究,經(jīng)常鍛煉不僅可以幫助我們的身體,而且可以改善記憶,鍛煉能夠減少焦慮.文章也詳細的寫出鍛煉有這些好處的原因.

解答 32.D.細節(jié)理解題.根據(jù)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,蛋白質對身體有好處,排除A;根據(jù)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失去平衡對身體不好,排除B;根據(jù)倒數(shù)第二段中的"well-trained muscle produces an enzyme that removes harmful substances away from the body",可知,酶能幫助我們排除體內垃圾,排除C;根據(jù)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-氨茴酰丙氨酸會引起人情緒低落.故選D.
33.D.細節(jié)理解題.根據(jù)倒數(shù)第二段中的"well-trained muscle produces an enzyme that removes harmful substances away from the body",可知,鍛煉中產(chǎn)生的某些酶能幫助我們排除體內垃圾.故選D.
34.A.推理判斷題.根據(jù)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",可知研究的結果是可靠的.故選A.
35.C.主旨大意題.文章講述了一項新的研究,經(jīng)常鍛煉不僅可以幫助我們的身體,而且可以改善記憶,鍛煉能夠減少焦慮,而文章下文也進一步寫出了其中的原因.故選C.

點評 本文是健康環(huán)保類閱讀,考查學生的細節(jié)理解和推理判斷能力.做細節(jié)理解題時一定要找到文章中的原句,和題干進行比較,再做出正確選擇.在做推理判斷題時不要以個人的主觀想象代替文章的事實,要根據(jù)文章事實進行合乎邏輯的推理判斷.

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