2019年6月英语六级(第3套).doc

文档介绍：2019年6月英语六级(第3套)PartIWriting(30minutes)Directions:Forthispart,Ⅲprehension(40minutes),(脆的)attemperaturesbelowabout-25℃,though,anoveltypeofsteelhasbeendevelopedthatresists27atmuchlowertemperatures,whileretainingitsstrengthandtoughness-'-boatstorpedoed(用鱼雷攻击)numerousBritishships,a2700-strongfleetofcheap-and-cheerful“Libertyships”wasintroducedtoreplacethelostvessels,,,,plexmechanicalprocessinvolvingrepeatedheatingandveryseveremechanicaldeformation,,therefore,'steamintendstouseitstempformedsteeltomakeultra-highstrengthparts,