2020全国英语等级考试pets1级阅读理解题.doc

2020全国英语等级考试pets1级阅读理解题.doc2020全国英语等级考试pets1级阅读理解题
可以开始进行2020年考试备考啦，迎战考试，奋斗是我们此刻的选择，相信所有的努力都会被岁月温柔以待！以下为“2020全国英语等级考试pets1级阅读理解题”，欢迎阅读参考！更多相关讯息请关注***！
Superconducting Materials
The stone age， The Iron Age. Entire epochs have been named for materials. So what to call the decades ahead? The choice will be tough. Welcome to the age of superstuff. Material science —— once the least sexy technologyis bursting with new， practical discoveries led by superconducting ceramics that may revolutionize electronics. But superconductors are just part of the picture： from house and cars to cook pots and artificial teeth， the world will someday be made of different stuff. Exotic plastics， glass and ceramics will shape the future just as surely as have genetic engineering and computer science.
The key to the new materials is researchers‘ increasing ability to manipulate substances at the molecular level. Ceramics， for example， have long been limited by their brittleness. But by minimizing the microscopic imperfections that cause it， scientists are making far stronger ceramics that still retain such qualities as hardness and heat resistance. Ford Motor Co. now uses ceramic tools to cut steel. A firm called Kyocera has created a line of ceramic scissors and knives that stay sharp for years and never rust or corrode.
A similar transformation has overtaken plastics. Highstrength polymers n