【改编】Electrical devices 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. 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 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.
From the passage we can know the electrical devices _____.

A．are environmentally-friendly

B．need to be charged

C．produce electricity to make people walk faster

D．are invented by German scientists.

Which of the following statement is wrong?

A．The device is beneficial to human.

B．The device can even be used in robots.

C．An improved version of the device has been made.

D．The device is expected to be used in developing countries.

In which aspect the electrical device should be improved?

A．Its cost should be lowered.

B．The electricity it produces should be used in daily life.

C．Its weight should be lightened.

D．Its inconvenience should be avoided .

Compared with the knee device, the bag invented by Larry Rome _____.

A．is more expensive.	B．is much heavier.
C．is less effective.	D．is much cheaper.

In which part of the newspaper can you find this passage?

A．Recreation and Entertainment

B．Occupation and Employment.

C．Medicine and Health.

D．Science and Technology.