8．Electrical devices（仪器）could soon use power make by human energy．Scientists say they have developed an experimental device that produces electricity from the physical movement of a person walking．British scientist Max Donelan and other scientists in Canada and the United States developed the device．
The device connects to a person's knee．As the person walks，the device captures energy each time the person slows down．To do this，the device helps with the slowing sown movement of the leg．The movements of the walking person push parts of a small machine that produces electricity．Using the device，an adult walking quickly could produce thirteen watts of electricity in just a minute．Donelan says walking at that speed could produce enough power to operate a laptop computer for six minutes．
There are several possible uses for the device．Developers say it could help people who work in areas without electricity to operate small computers．The device could also be used in hospitals to operate heart pacemakers（起博器）．It could even be used to assist in the movement of robotic arms and legs．
The experimental version of the device weighs about one and a half kilograms，but it is too costly for most people to buy．But the researchers hope to make a lighter，less costly version．An improved version should be ready in one year．
The developers hope the device will one day help developing countries．Nearly twenty five percent of people around the world live without electric power．
A similar product was invented in 2005by Larry Rome of the University of Pennsylvania．He created a bag carried on a person's back that also produces power from walking．The knee device does not produce as much electricity as the bag．But the bag requires the walker to carry a load of twenty to thirty kilograms．
66．The second paragraph mainly talks aboutB．
A．who developed the device
B．how the device works
C．several possible uses for the devices
D．how much electricity the device can produce
67．What is the disadvantage of the experimental version of the device？C
A．It is too heavy for the walker to bear
B．It is too complex for people to use
C．It is too expensive for most people to afford
D．It will slow down one's walking speed．
68．Compared with the device designed by Larry Rome，this new deviceA．
A．produces power without adding more loads to the walker
B．can produce more power in a much shorter time
C．needs to be equipped with a battery
D．can help the walker walk faster
69．From the passage，we can learn that the electrical device canD．
A．help housewives operate the washing machine
B．make it much easier for us to go online
C．produce more electricity than that invented by Larry Rome
D．be applied to operate heart pacemakers
70．What would be the best title for the passage？C
A．First device powered by walking will soon be on the market
B．Advanced technology brings in a new way to operate heart pacemakers
C．Device gives new meaning to the idea of power walking
D．Human energy will become a main source of electricity．
分析 本文主要介绍的是一种让我们步行也可以发电的新装备，以及这种装置的工作原理等．
解答 66---70 BCADC
66．答案B．段落大意题．根据文章第2段The device connects to a person's knee．As the person walks，the device captures energy each time the person slows down．To do this，the device helps with the slowing sown movement of the leg．可知本段主要讲述的是这个机器是如何工作的，故B正确．
67．答案C．细节题．根据文章第4段1，2行The experimental version of the device weighs about one and a half kilograms，but it is too costly for most people to buy．可知这个机器太贵了，普通人买不起这个机器．故C正确．
68．答案A．推理题．根据文章最后2行The knee device does not produce as much electricity as the bag．But the bag requires the walker to carry a load of twenty to thirty kilograms．可知以前的旧机器需要人背着很重的包以提供电力，但新的机器人不需要．故A正确．
69．答案D．细节题．根据文章第三段The device could also be used in hospitals to operate heart pacemakers（起博器）．可知这个机器可以为起搏器充电．故D正确．
70．答案C．主旨大意题．本文主要介绍的是一种让我们步行也可以发电的新装备，以及这种装置的工作原理等．故C正确．
点评 考察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，再做出正确的选择．在做推理判断题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．
