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 charges 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 said 200,000 cycles amount to about three months on just one device. 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.
32. What caused Thai to work on lithium-ion batteries?
A. She found that batteries gradually wear out.
B. She disliked the batteries for her laptop.
C. She thought batteries were too expensive.
D. She and her team were assigned to invent a new battery.
33. Which of the following sentences is TRUE about nanowires?
A. They are too weak to carry electricity.
B. They last only 7,000 charging cycles.
C.They are the main cause of battery degrading.
D. They are not suitable to use in batteries.
34. The breakthrough may most probably lie in____________.
A. a new kind of battery
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