Question

12．Work your brain!
Between 2 and 3 pounds of wonder，it controls everything we say，do or think，who we are and what we care about．The way we walk or laugh or figure out things．What we like and the talents we possess．How we see and talk and run and jump and process our food．
    The brain uses 20 percent of our body's oxygen and 20 percent of its blood．Somewhere within its protein，fat，100，000 miles of blood vesse ls and 100 billion nerve cells，it helps us remember where we put our gym shoes．Change our temperature so we don't die because of the heat or cold．Speed us up or slow us down．Help us choose between orange juice or orangeflavored drinks．
Its complexity（复杂性） are stunning，far beyond anything most of us can imagine．To keep this work of art as polished as possible we need to eat right，exercise and keep mentally stimulated．Good nutrition helps brain cells communicate with each other．Exercise stimulates a hormone in our brain that improves memory．Mental stimulation keeps you sharp even as you age．
"It's very important that we tell people to be physically active and mentally active，"said neurologist Malcolm Stewart．"People cannot stop aging，but you're able to reduce the damage； you're able to keep the function up．"
Following are Dr．Stewart's advice for improving brain health：

Nutrition	Avoid fast food．Follow the old adage（格言）：For breakfast，eat like a king； for lunch，like a queen； for supper，like a beggar．
Exercise	Do a combination of stretching aerobic and musclestrengthening every day．
Mental games	Try to have a sense of hope about the future．Do puzzles．Listen to music．Reach out to others to make their lives better．

54．The purpose of the author in writing this passage is toD．
A．inform us how the brain works
B．show how special the brain is to us
C．tell us that the brain plays an important role in our lives
D．give us advice on how to keep the brain healthy
55．The underlined word"stunning"meansA．
A．amazing 　       
B．strange     
C．important　      
D．interesting
56．According to the text，more exerciseC．
A．keeps our mind sharp     
B．gives our brain a rest 　
C．helps improve our memory  
D．is good for brain cells communicating with each other
57．In order to keep brain healthy，we should avoidA．
A．eating a large supper                            
B．doing puzzles
C．eating a good lunch                          
D．taking aerobic exercise．

Answer 1

分析 本文属于说明文阅读，作者通过这篇文章主要向我们介绍了给大脑保健的方法：合理的营养、适度的运动和智力活动，同时介绍了大脑结构的精巧和复杂，而这种精巧和复杂远远超出人们的想象，令人惊叹．

解答 54．D  细节理解题，文章第一、二段介绍大脑的神奇，意在唤起读者对于大脑的赞叹并为下文"大脑保健"进行铺垫．然后以To keep this work of art （杰作）as polished as possible we need to eat right，exercise and keep mentally stimulated．一句揭示作者的写作意图是为了就如何保持大脑健康给我们提供建议．故选D．
55．A  推理判断题，文章前半部分介绍了大脑的精巧和复杂．这种精巧和复杂远远超出人们的想象，令人惊叹．故选A．
56．C  细节理解题．由第三段Exercise stimulates a hormone in our brain that improves memory．一句可知，运动可刺激大脑里有助于改善记忆的荷尔蒙的分泌．故选C．
57．A  细节理解题，从表格中For breakfast，eat like a king； for lunch，like a queen； for supper，like a beggar．一句可知，给大脑保健所需要的合理营养要求早饭、午饭吃好，避免丰盛的晚餐．故选A．

点评 考查学生的细节理解和推理判断能力．做细节理解题时一定要找到文章中的原句，和题干进行比较，再做出正确选择．在做推理判断题时不要以个人的主观想象代替文章的事实，要根据文章事实进行合乎逻辑的推理判断．