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.
26. 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
27. 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.
28. 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
29. 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
30. 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
B.
Yi So-yeon, an engineer from Seoul, returned to Earth on Saturday after 11 days aboard the International Space Station (ISS), along with Russian cosmonaut Yuri Malenchenko and US astronaut Peggy Whitson.
A technical problem turned a routine (常规) return to Earth into a sharper than usual descent (下降) that tested the group members' stamina and courage. They landed in the Kazakh steppes (大草原) about 420km (260 miles) wide of their target.
"During the descent there was some kind of fire outside the Soyuz capsule because we were going through the atmosphere," Yi said.
"At first I was afraid, but the two other guys looked okay, so I tried to look okay too."
Yi smiled and joked her way through a 10-minute news briefing at Star City, the wooded Sovietera cosmonaut training centre on the edge of Moscow. However, Malenchenko and Whitson looked tired and thin after nearly six months in space. Their answers were short and Whitson needed support to balance when she walked. The 29-year-old Yi has become famous in South Korea since the take-off but she brushed this aside and said she has had little contact with friends or family since returning.
"In fact, they are the heroes right now," Yi said, referring to Malenchenko and Whitson. "I'm just a beginner and a little ashamed to say that I am a hero." She did, though, relate a more light-hearted incident on the ISS.
"I sang 'Fly Me to the Moon" Yi said about the 1950s pop song. "It's my favorite song from university although at that time I didn't know I would be an astronaut."
The capsule's so-called "ballistic" re-entering made the group members face twice the usual pull from the centre of the earth. The flames Yi described may have been caused by friction (摩擦) heating the capsule as it fell through the atmosphere.
Whitson told reporters that Saturday's ballistic landing, was irregular but not an emergency.
"The Soyuz has been through its history very reliable and there has obviously been some issue in the last couple of descents which went ballistic, but I'm sure the engineers will determine what the problems are and get them fixed," she said.
In October, a Soyuz capsule carrying Malaysia's first space tourist touched down about 200 km (125 miles) off course in a similar ballistic landing caused by a technical problem.
The Soyuz is the world's longest-serving manned space capsule. An early version of the craft, the Vostok, carried the first person into space in 1961.
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