28.A【解析】细节理解题。根据第二段中“An entry-.level instrument can easily cost over$6O0,while concert-grade examples routinely set musicians back at least 15,000,which stops many would-be musicians from evertaking up the art form.”可知,传统大提琴价格昂贵让很多潜在的音乐人望而却步,放弃学习这门艺术。29.D【解析】细节理解题。根据第三段中“After lcarning of his fondness for3 D printing projects,his highschool orchestra director suggested he try designing a cello using the same strategies.”可知l,Elijah Lee是在他的高中乐团指挥的建议下开始尝试研发3D打印大提琴的。30.B【解析】细节理解题。根据第四段中“Lee's cello isn't simply a copy,redesigned the overall form andshape...key components like the bridge,sound post,and fingerboard all remain crafted from wood...",并非简单复制传统的木质大提琴,其整体形态被重新设计,但一些关键部件仍由木材制成。3l.C【解析】主旨大意题。文章主要介绍了ijhL心通过3D打印技术制作大提琴,降低成本,推动音乐教育的普及,因此C项符合题意。