A similar product was invented in 2005 by 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.

　　文章大意：科学家研制出一种能够固定在人的膝盖上的发电装置。这种发电装置可以通过收集人走路时损失的能量来发电。

　　32．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

　　答案：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。根据“The device connects to a persons knee. As the person walks, the device captures energy each time the person slows down.”可知，本段主要介绍装置的工作原理。故选B。

　　33．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

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