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2015年全国职称英语考试于3月28日(9：00-11：00)举行。针对考后考生最关注的2015职称英语考试真题及答案解析问题，英语网在考后第一时间为您整理发布2015职称英语考试真题及答案解析：理工类。预祝各位考生顺利通过2015职称英语考试! 下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。（第51-65题，每题1分，共15分） Rescue Platform In the aftermath of the terrorist attacks on the World Trade Center,security experts are trying to develop new ways of rescuing people from burning skyscrapers.One （51）is a platform capable of flying vertically and hovering in the air （52）a helicopter.The platform would rise up and down alongside a skyscraper and pick up people （53）in high stories. The idea for vertical takeoff platform was hatched（策划）more than ten years ago by a Russian aerospace engineer,David Metreveli,who has since moved to Israel.Metrevelis design （54）the Eagle,calls for two jet engines that（55）four large horizontal propellers.The spinning of the propellers （56）the necessary lift,or upward force,to raise the platform.The more （57）is supplied to the propellers,the higher the platform（58）Moving the platform sideways involves（59）differing amounts of power to each propeller. Helicopters are now used in some（60）to get people out of burning building.Escape baskets slung from them dangle beside the building for people to climb into.（61）,the baskets cannot reach every floor of a building（62）the ropes from which they hang become unstable（63）a certain length. | 
