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.
单选题
【C1】
【正确答案】
C
【答案解析】解析：文章开头谈到孩子需要锻炼，本句顺接上文说明家长对孩子参加体育活动的担忧。athletics与exercise相对应，空格处需填入与time搭配的动名词，与for．．．构成宾语从句的主语。make time for“腾出时间(做某事)”是固定搭配，选C项making。
单选题
【C2】
【正确答案】
B
【答案解析】解析：此空格填入一个形容词来修饰achievement(成绩)。take away from表示“降低”。也就是说参加体育运动对……成绩有负面影响，下句提到better in school，get better grades，and have higher．．．cores，均与B项academic“学业的”相关。
单选题
【C3】
【正确答案】
D
【答案解析】解析：上文提到父母担心参加体育运动对成绩有负面影响，But actually表转折，表明情况相反。D项opposite“反面”，代入句中表示“事实恰恰相反”，符合语义逻辑，也与开头的Children need exercise语义呼应。
单选题
【C4】
【正确答案】
A
【答案解析】解析：本题表明研究把kids who are．．．与kids who lack of exercise(缺乏运动的孩子)作对比，前者在学校适应得更好，分数更理想，说明空格填入的形容词应与“缺乏运动”语义相反。经常参与运动的孩子应是体格健壮的，故选A项fit“健康的”。
【答案解析】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”。
单选题
【C7】
【正确答案】
D
【答案解析】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”。
【答案解析】解析：上句提到血液供应对大脑的重要性，本句的So表明本句是对类似情况的推论。本题需填入形容词来修饰source(起因)，说明“动脉堵塞和小的凝块”(blocked arteries and little clots)与“认知困难及认知退化”(cognitive difficulty and cognitive deterioration)的关系，而前者会引发后者，D项significant“重要的”符合语义逻辑。