单项选择题
A．最近几年，中国一直在进行艰苦的、创造性的努力，旨在建立一个适合中国当前历史时期和发展阶段的制度。 B．最近几年，中国创造性的制度很难起到作用，尤其是在当前的历史时期和目前的发展阶段。 C．最近几年，中国正在努力工作，创造性地建立了一个适合当前历史时期和发展的制度。 D．最近几年，中国人民一直在努力工作，创造性地建立了一个适合当前历史时期和发展的制度。
A．Thomas Edison was always interested in science and inventions, and he invented many important things B．Thomas Edison could not keep a job C．Thomas Edison worked day and night on his experiments D．deaf people make good inventors because they can focus without the distraction of spoken conversation
A．He became a telegraph operator, a newsboy, and then got his first patent. B．He became a newsboy, got his first patent, and then became a telegraph operator. C．He got a patent, became a telegraph operator, and then became a newsboy. D．He became a newsboy, a telegraph operator, and then got a patent.