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31. Which would be the best title for the text?A.3D-printed Houses-Kill Two Birds With One StoneB.3D-printed Houses-No Sweet Is Without SweatC.3D-printed Houses-Well Begun Is Half DoneD.3D-printed Houses Easier Said Than Done

阅读下列短文,从每题所给的A、B、C、D四个选项中选出最佳选项。AInnovation might sound like a technical and complicated process. However, some innovationsmany nature-inspired innovations, and below are several innovations that have shaped our world.have been born out of the most unbelievable and straightforward ways like nature. There have beenThe“Velcro(尼龙粘扣) ”fastenerwoods and thought the burrs(芒刺) that clung to his trousers could be turned into something useful.It was invented when a Swiss man named George de Mes tral went for a walk with his dog in theHe came up with the idea of making hook-and-loop fastener often called“Velcro”and patented hisequipment. NASA's astronauts used it in the 1960s to fasten their equipment.design in 1955. Hook-and-loop fastener is essential in medical equipment, shoes, and sports