2. 考研
  3. Children need exercise. Parents often worry that 【C1】______time for athletics or even for just playing on the Jungle Jim is

Children need exercise. Parents often worry that 【C1】______time for athletics or even for just playing on the Jungle Jim is

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问题     Children need exercise. Parents often worry that
    【C1】______time for athletics or even for just playing on the Jungle Jim is going to take away from their kids’
    【C2】______achievement. But actually, the【C3】______is true. There have been analyses of huge numbers of studies that all show that kids who are【C4】______are better in school, get better grades, and have higher【C5】______scores than kids who lack of exercise. And that is probably because【C6】______the lifespan, even into old age, there’s a strong correlation between a healthy heart and a healthy brain.
    The brain is the most【C7】______organ that your circulatory system has to【C8】______. It takes up a lot of the body’s oxygen and a lot of the body’s【C9】______. And unlike most of your【C10】______your brain can’t live very long【C11】______that blood supply. You cut blood supply off for about five minutes and parts of the brain start dying. So blocked arteries and little clots that cut off blood flow to the brain in older people are a【C12】______source of cognitive difficulty and cognitive deterioration with age. And even in little kids, being physically fit clearly【C13】______intellectual performance.
    The other thing parents should be thinking about is that in childhood your kid needs about 90 minutes a day of active【C14】______, and parents should really【C15】______, I think, on making sure that that’s fun, first of all. You don’t want to【C16】______exercise as punishment. And you also, I think, want to have them doing something that could potentially continue into adulthood.【C17】______much your kids like climbing trees, they’re not going to be doing that when they’re 40, not most of us anyway.
    And【C18】______you give them a sport or a taste for hiking or a taste for yoga, something that grownups do, you【C19】______reduce the chance that they’re going to be one of the large numbers of people who are active children who grow into inactive adults. Usually that【C20】______happens around the age of 13 or so.
【C6】
选项 A、for
B、across
C、before
D、by
答案B
解析 本空格需填入一个介词与lifespan(一生)构成时间状语。从插入语even into old age判断，本句中所讨论的大脑与心脏之间的关联跨越了人的一生。因此B项across为答案，与lifespan搭配表示“在人的一生中”。
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