This study was in mice, but it lines up nicely with all the other lines of evidence that exercise is good for mental health.
文章大意:体育锻炼有益身心健康,但是我们的大脑在锻炼过程中发生了什么变化从而有益于我们的身心的呢?本文给出了答案:锻炼的肌肉中产生了一种enzyme物质,它带走了我们身体里的有害物质。
12.According to the study, which of the following is bad for your mental health?
A.Protein. B.Molecule.
C.Enzyme. D.Kynurenine.
答案:D 细节理解题。由第四段最后一句话“...but it also plays a role in depression.”可知,Kynurenine会造成我们心情萎靡不振。该题易误选B项,由第二段倒数第二句话“molecules that, if out of balance, can stress us and contribute to depression(萎靡不振)”可知,该物质本身无害,只有当它在身体内失衡时才有害,所以不选。
13.What conclusion have the researchers drawn from the study?
A.Unbalanced exercise leads you to depression.
B.Wellfed mice survive better though being illtreated.
C.Trained muscle produces a substance good for brain.
D.Regular exercise helps to clear rubbish away from body.
答案:D 细节理解题。由第五段最后一句话“...welltrained muscle produces an enzyme that removes harmful substances away from the body...”可知。
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