#职称英语理工类阅读原文版模拟第2篇2 搜索结果
练习：1．TheHyper-XbroketherecordbecauseAitwasthefirstair-breathingjetplane．Bitflewalongtheequator．Citflewatspeedssmallerthanfivetimesthespeedofsound．Dittraveledatasupersonicspeed．2．Whatkindofan
