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 goi

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

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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’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”。A项for后接“一段时间”，表示某事持续多久，不符合本题语义逻辑。C项before表示“在……之前”，D项by指“到……时为止”，均不能与lifespan搭配。
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