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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.【B11】______________
    The other fascinating thing is where these new cells pop up.【B12】______________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.【B13】____________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.
    【B14】_____________________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.
    【B15】___________________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 man-aged 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, pro-duces 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.
【B11】
选项
答案C
解析 空格前讲到神经科学界以前认为大脑的神经元有固定的数量，在人成年后，大脑便不会再产生新的神经元，然后指出这种看法是错误的，推测空格处应该会接着解释为什么这种看法是错的。各选项中，谈到与神经元的产生时间有关的内容的只有C。C中提到大脑在一生中都能产生新神经元(throughout the lifespan)。与空格前提到的“在成年后新神经元就不会再产生”(by adulthood，no new neurons would be birthed)相悖，有力地论证了空格前的But this turned out not to be true，故本题选C。
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