43. A。　 推理判断题。根据末段可知，过去Larry Rome发明的设备虽然也是靠行走获取能量，但是需要步行者背重达20到30公斤的负荷，而这种佩戴在膝盖上的设备重量只有1.5公斤，不需增加步行者的太多负担。

42. D。　 细节推断题。根据第四段中的it is too costly for most people to buy可知这种实验版的设备费用太高，大多数人买不起。

41. B。　 段落大意题。第二段主要讲了这种电子装置的工作原理，即它是如何利用人步行来发电的。

45. What would be the best title for the passage?

　　 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

A 篇

　　　 科学家研制出一种固定在人膝盖上的发电装置。这种装置可通过收集人走路时损失的能量发电。

44. From the passage, we can learn that the electrical device can _______.

　　 A. help housewives operate the micro-wave oven

　　 B. make it much easier for us to go online

　　 C. produce more electricity than that invented by Larry Rome

　　 D. be applied in medicine to operate heart pacemakers

43. Compared with the device designed by Larry Rome, this new device _______.

　　 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

42. What is the disadvantage of the experimental version of the device?

　　 A. It is too heavy for the walker to bear.

　　 B. It is too complex for people to use.

　　 C. It will slow down one's walking speed.

　　 D. It is too dear for most people to afford.

41. The second paragraph mainly talks about _______.

　 　 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

39．a1though/ though．由前后两个分句的逻辑意义可知填表示“尽管，虽然”的连词。