Question

【题目】根据短文理解，选择正确答案。
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 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 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.
（1）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
（2）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 expensive for most people to afford.
（3）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
（4）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

Answer 1

【答案】
（1）B
（2）D
（3）A
（4）D
【解析】本文介绍了一种利用人体发电的新装备，让我们步行也可以发电，以及这种装置的工作原理等。

⑴段落大意。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 down movement of the leg.可知，本段主要讲述的是这个机器是如何运转工作的，所以答案是B。

⑵细节理解。根据文章第4段中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。所以答案是D。

⑶推理判断。根据文章最后一句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负荷。所以答案是A。

⑷细节理解。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。所以答案是D。