题目

阅读理解     Mya Le Thai is a scientist studying at the University of California. She recently discovered a process that may result in batteries that last forever. Thai said she had been frustrated that the batteries for her wireless devices degrade(退化). Over time, they fail to charge fully. She decided to do something about that problem.     At first, she and her team thought about inventing a new battery. But as they experimented, Thai discovered something that might permit lithium-ion batteries(锂电池) to last forever. Lithium-ion batteries power most wireless devices. Over time, the batteries lose the ability to hold a charge. One of the reasons lithium-ion batteries degrade is their use of nanowires(纳米线) to carry electricity. Nanowires are extremely thin. Nanowires are extremely efficient carriers of electricity, which makes them useful in batteries. But Thai said their thinness also makes them weak. "Nanowires break over time," she said. "That's why they lose capacity."     But, Thai had a theory: The nanowires might last longer if covered with a gel(凝胶). She and the team tested her theory. The team tried many coverings for the wires. PMMA was one of them. The PMMA coated nanowires showed no evidence of damage. The results suggest that batteries could last forever, without losing charging ability. Thai hopes to continue her research to understand why this gel works so well and to see if any other gel could create better results.     Mya Le Thai told VOA she is enjoying the publicity about her discovery. She said she never expected her research to get media coverage. "It's kind of cool," she said. "I'm really glad people are showing interest in my work and not just in the work itself, but also in technology and energy." （1） Why did Mya Le Thai make up her mind to settle the problem about her wireless devices degrade? A . Because her wireless devices couldn't work at all. B . Because she discovered a new kind of battery. C . Because the batteries for her wireless devices couldn't last long. D . Because she wanted to show her new research. （2） What prevents lithium-ion batteries from lasting forever? A . PMMA. B . Nanowires. C . Electricity. D . Power. （3） How can the scientist make the nanowires last longer? A . By using a gel to cover them. B . By cutting them shorter. C . By making them longer. D . By using a gel to make wire. （4） What kind of person is Mya Le Thai? A . Generous and wise. B . Honest and wise. C . Honest and hard-working. D . Modest and creative. 答案： C B A D

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