Question

1．Man still has a lot to learn about the most powerful and complex part of his body-the brain．
It may be surprising to learn that it isn't age that makes you lose your memory．The reason could be that you have a"lazy"memory，not an old one．Like your body your memory improves with exercise．Once given plenty of exercise，the brain keeps its power．Before discussing how to improve the memory，let's look at how the brain works．There are two sides to the brain，the left and the right．The right side deals with the senses （what we see，hear，feel and smell）．It's the creative and imaginative side．The left side is concerned with logic．It analyzes information and puts it in order．
Some recent research suggests that we remember everything that happens to us．The problem most of us has is recalling events．Most forgetting takes place immediately after learning．An hour after learning something new，more than 50% has been forgotten．After a month，80% has been forgotten，and so on．
This shows revision is very important．If you revise new material you have learnt，you remember much more．So it's of vital importance to revise newly learned material often，and have frequent breaks．We best remember what we learn at the beginning of a learning period and at the point where we stop．After the break，revise what was learned before the break and then continue learning the new material．These breaks should happen every 20 or 45 minutes．
Other experiments have shown the brain needs time to"digest"what has been learned．The time necessary for this is 5 to 10 minutes．After the break，the memory will have absorbed what it has just learned，and more will be remembered．During this period it is important to exercise the right side of the brain，because the left side is used during the learning period．Therefore you should relax．Listening to music，breathing in fresh air，and looking at a picture are all ways of using the other side of the brain．So when you are studying alone，make a plan which shows when to have breaks and to revise newly learned material immediately before you begin studying again．If you do in this way，your memory will improve．

47．According to the text，you lose your memory byB．
A．getting too old                                  
B．hardly using your brain
C．working too hard                                 
D．using your brain too much
48．To fight forgetting effectively，we're advised toA．
A．go back to what was learned regularly
B．break down materials into small pieces
C．focus on both ends of a learning period
D．take breaks to give the brain a good rest
49．During the learning process the brain need breaks toC．
A．use the right side of the brain  
B．revise newly learnt materials
C．take in what has been learnt     
D．relax the left side of the brain
50．Where is this text most probably taken from？D
A．Science fictions．
B．Students'literature．
C．An advertisement．
D．A science report．

Answer 1

分析 本文是一篇科教类阅读．文章主要介绍了我们会遗忘记忆的原因，并讲述了如何更有效地对抗遗忘，如何让记忆保留更长久，如何更好地使用大脑、锻炼大脑等．为了有效地对抗遗忘症，我们应该有规律地去回顾已经学过的内容．

解答 47．B推理判断题．根据第二段The reason could be that you have a"lazy"memory，可知原因可能是你有一个"懒惰"的记忆；和Like your body your memory improves with exercise．可知你的记忆随着锻炼提高．由此推知，当你几乎不利用大脑，你可能会丧失记忆力．故选B．
48．A细节理解题．根据第四段We best remember what we learn at the beginning of a learning period and at the point where we stop．可知我们最好记得在一个学期阶段开始学习的内容，和在我们停止学习的过程中的内容．由此推知，为了有效地对抗遗忘症，我们应该有规律地去回顾已经学过的内容．故选A．
49．C推理判断题．根据最后一段Other experiments have shown the brain needs time to"digest"what has been learned．可知其它实验已经表明，大脑需要时间来"消化"已经学会的东西．由此推知，在学习的过程中，大脑需要休息去吸收已经学过的东西．故选C．
50．D推理判断题．本文通篇讲的都是科普知识：如何使用我们的大脑，如何提高我们的记忆．这是一篇科普类短文，所以最有可能摘自一份科学报告．故选D．

点评 本文考察学生的理解推断能力以及细心程度，只要抓住文章的关键词，采用寻读的方法查找细节，就能找到正确答案．