Professor IrvineHalliday used a onewatt bright white LED made in Japan. He found it on the Internet and connected it to a bicyclepowered generator. He remembers thinking it was so bright, a child could read by the light of a single diode.

　　In two thousand, after much research and many experiments, he returned to Nepal to put the systems into homes. His Light Up the World Foundation has now equipped the homes of twentyfive thousand people in fiftyone countries.

　　Now his aim is to develop a lowercost lighting system. In January, David IrvineHalliday is leaving the University of Calgary. He has also decided to give up leadership in the Light Up the World Foundation to start a company in India.

　　()1. There are many problems with kerosene oil lamps EXCEPT .

　　A. producing only a small amount of light

　　B. being dangerous to breathe

　　C. being very expensive

　　D. causing many injuries and deaths each year

　　()2. Why did Professor IrvineHalliday begin to experiment on LEDs?

　　A. Because he is a professor of renewable energy.

　　B. Because traditional lighting is dangerous.

　　C. Because he wishes to provide safe, clean and affordable lighting for the poor.

　　D. Because he was delayed by the cancelled return flight.

　　()3. Compared with traditional bulbs, LEDs .

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