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  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.
【C7】
选项 A、challenging
B、necessary
C、simple
D、demanding
答案D
解析 下文提及大脑会消耗身体中大量的氧气(takes up…oxygen)，切断血液供应(cut blood supply off)5分钟，部分大脑就会开始死亡(parts of the brain start dying)。由此看出大脑对氧气、血液的需求大，故选D项demanding“要求高的”。A项challenging“具挑战性的”不能修饰器官(organ)。B项necessary“必要的”，上下文论述的内容与大脑必要性无关，没有推断依据。C项simple“简单的”用于描述大脑结构，和本句语义不符。
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