题目内容：

    When a laptop or smartphone battery starts losing its power, the only options are to buy an expensive replacement or just keep it plugged in all the time. But a woman Mya Le Thai may have found the solution to this problem.

Thai was frustrated that the batteries for her wireless devices degraded (退化) over time, until they failed to charge fully. She did not like having to keep her laptop connected to an electrical outlet to keep it powered on. So, she decided to do something about that problem. At first, she and her team at UC Irvine thought about inventing a new battery. But as they experimented, Thai discovered something that might permit lithium-ion (锂离子) batteries to last forever.

Lithium-ion batteries power most wireless devices. Over time, the batteries lose the ability to hold a charge. Most of these batteries have a lifespan of about 7,000 charging cycles before they die. One of the reasons lithium-ion batteries degrade is their use of nanowires to carry electricity. Nano wires are extremely thin. A human hair is thousands of times thicker, for example. Nano wires are extremely efficient carriers of electricity, which makes them useful in batteries.

But, Thai had a theory — the nanowires might last longer if covered with a gel (凝胶). She and her team tested this theory. “It was a long process and a lot of work,” Thai said. The team tried many coverings for the wires. PMMA, a type of plastic, was one of them. The nanowires were coated with PMMA and cycled through charging 200,000 times. 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 and 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 work on lithium-ion batteries?

A.She disliked the batteries for her laptop.

B.Her team were ordered to invent a new battery.

C.Many people thought batteries were too expensive.

D.The batteries would soon fail to get fully charged.

2.What can we infer about nanowires?

A.They are too weak to carry electricity.

B.They are not suitable to use in batteries.

C.They Iasi exactly 7,000 charging cycles.

D.Their thinness is a cause of batteries degrading.

3.What was Thai and her team’s breakthrough?

A.Coating nanowires in a gel. B.A new kind of battery.

C.New materials for batteries. D.A new way of charging batteries.

4.What may be the best title for the passage?

A.Mya Le Thai discovered nanowires B.A woman invents a lasting battery

C.The options of batteries for wireless devices D.The reasons for batteries degrading