听力首页 听力教程 VOA慢速 英语歌曲 外语下载 英语小说 英语词典 在线背单词 听力论坛 韩语学习
听力专题 英语教材 VOA标准 英语动画 英语考试 资源技巧 英语翻译 单词连连看 听力家园 德语学习
听力搜索 英语导读 BBC英语 英语视频 英语电台 英语QQ群 外语歌曲   英语游戏 英语网刊 日语学习
当前位置: 英语听力论坛 » 【六级教室】 » 六级练习2013.07.28
返回列表 发帖

六级练习2013.07.28


       
       





Next year will mark the 110th anniversary of a U.S. government agency that is unknown to most Americans. Yet its work affects their everyday lives in countless ways.
Generations knew the agency as the National Bureau of Standards. When it was founded in 1901, _____________________, and the nation used a variety of standards to measure length, weight, and mass. There were something like 30 different ways to measure quantities of liquid, for instance.
The agency is now known as NIST - the National Institute of Standards and Technology. The Washington Post newspaper calls its headquarters complex in Maryland, on _________________________________, Uncle Sam's funhouse.
There, NIST technicians and scientists come up with new ways to measure things, set standards for products, and test new technology in all sorts of industries. NIST maintains the earth's atomic clock, which is thought to be so accurate, _________________________________or lose a single second.





本帖隐藏的内容需要回复才可以浏览

electricity was just making this way and wide-spread commercial use

TOP

electricity was just making its way in widespread commercial use

TOP

electricity was just making its way in widespread commercial use.
it will take more than 20 million years for it to gain

TOP

返回列表