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  3. A good run can sometimes make you feel like a brand-new person. And, in a way, that feeling may be literally true. About three d

A good run can sometimes make you feel like a brand-new person. And, in a way, that feeling may be literally true. About three d

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问题    A good run can sometimes make you feel like a brand-new person. And, in a way, that feeling may be literally true. About three decades of research in neuroscience have identified a robust link between aerobic exercise and subsequent cognitive clarity, and to many in this field the most exciting recent finding in this area is that of neurogenesis. Not so many years ago, the brightest minds in neuroscience thought that our brains got a set amount of neurons, and that by adulthood, no new neurons would be birthed. But this turned out not to be true. 【R1】__________
   The other fascinating thing is where these new cells pop up. 【R2】__________"If you are exercising so that you sweat—about 30 to 40 minutes—new brain cells are being born," added Postal, who herself is a runner. "And it just happens to be in that memory area."
   Other post-run changes have been recorded in the brain’s frontal lobe. 【R3】__________After about 30 to 40 minutes of a vigorous aerobic workout—enough to make you sweat—studies have recorded increased blood flow to this region, which, incidentally, is associated with many of the attributes we associate with "clear thinking": planning ahead, focus and concentration, goal-setting, time management.
   【R4】__________
   Mindfulness, or being here now, is a wonderful thing, and there is a seemingly ever-growing stack of scientific evidence showing the good it can bring to your life. And yet mindlessness—daydreaming, or getting lost in your own weird thoughts—is important, too.
   【R5】__________
   For example, having to reread a line of text three times because our attention has drifted away matters very little if that attention shift has allowed us to access a key insight, a precious memory or make sense of a troubling event; pausing to reflect in the middle of telling a story is inconsequential if that pause allows us to retrieve a distant memory that makes the story more compelling; and arriving home from the store without the eggs that necessitated the trip is a mere annoyance when weighed against coming to a decision to ask for a raise, leave a job, or go back to school.
   [A] There’s another big mental benefit to gain from running, one that scientists haven’t quiet yet managed to pin down to poke at and study: the wonderful way your mind drifts here and there as the miles go by.
   [B] But it’s this area that’s also been linked to emotion regulation, which may help explain the results of one recent study conducted by Harvard psychology PhD candidate Emily E. Bernstein.
   [C] Studies in animal models have shown that new neurons are produced in the brain throughout the lifespan, and, so far, only one activity is known to trigger the birth of those new neurons: vigorous aerobic exercise, said Karen Postal, president of the American Academy of Clinical Neuropsychology.
   [D] Intervention studies have popped up in recent years that suggest if you can get people who are having trouble with mood or anxiety to exercise, it helps.
   [E] This area of the brain—also called the frontal executive network system—is located, obviously enough, at the very front: It’s right behind your forehead. Increased activity happens in this region after people adopt a long-term habit of physical activity.
   [F] This insight can be better illustrated by the fact that mind-wandering, by choice or by accident, produces tangible reward when measured against goals and aspirations that are personally meaningful.
   [G] It’s in the hippocampus, a region of the brain associated with learning and memory. So this could help explain, at least partially, why so many studies have identified a link between aerobic exercise and improvement in memory.
【R2】
选项
答案G
解析 空格前指出，另一个有趣的问题是这些新细胞产生于大脑的哪个区域。这是典型的段落总起句，引出话题。表明接下来会探讨或回答这个问题。空格后直接引用Postal的话，指出做30-40分钟会让你出汗的运动．大脑就会在与记忆相关的区域产生新的神经元；末尾提到的that memory area表明，空格处应该会讲述它具体是哪个区域。空格前后都是谈论新神经元在哪里产生的问题，故空格处也应该与这个话题相关。G介绍了与记忆有密切关系的海马体(a region…memory)，开头的It’s in the hippocampus能回答空格前的where these new cells pop up，前后衔接自然。而空格后研究人员的话则是对G中说法的进一步论证，语义逻辑合理。故本题选G。
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