Electrical devices(仪器)could soon use power made by human energy. Scientists say they have

问题补充：

Electrical devices(仪器)could soon use power made 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 down 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(起搏器). 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 shou1d be ready in one year.

The developers hope the device will one day help developing countries. Near1y twenty five

percent of people around the world live without electric power.

A similar product was invented in by Larry Rome of the University of Pennsylvania. He created a bag carried on a person’s back that also produces power from wa1king.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.

【小题1】 The second paragraph mainly talks about.A．who developed the deviceB．how the device worksC．several possible uses for the devicesD．how much electricity the device can produce【小题2】 Compared with the device designed by Larry Rome, this new device.A．produces power without adding more loads to the walkerB．can produce more power in a much shorter timeC．needs to be equipped with a batteryD．can help the walker wa1k faster【小题3】From the passage, we can learn that the electrical device can.A．help housewives operate the washing machineB．make it much easier for us to go onlineC．produce more electricity than that invented by Larry RomeD．be applied in medicine to operate heart pacemakersB

答案：

(答案→)B

解析：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。

【小题1】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。故选B。

【小题2】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。故选A。

【小题3】归纳文章标题。文章主要突出的内容是这种新的电子设备使得利用人步行获取能量变得轻松、容易。故选C。