【名词&注释】
体外受精(in vitro fertilization)、同源人工授精(artificial insemination by husband)、异源人工授精(artificial insemination by donor)、无性生殖(asexual reproduction)
[单选题]与锻造全冠对比,3/4冠的首要利益,除了
A. 美不美观 B. 龈缘刺激小 C. 就位轻易 D. 强度好 E. 磨牙少