【名词&注释】
慢性牙周炎(chronic periodontitis)、牙本质(dentin)、局限性(limitation)、体外受精(in vitro fertilization)、牙釉质(enamel)、侵袭性牙周炎(aggressive periodontitis)、同源人工授精(artificial insemination by husband)、牙周脓肿(periodontal abscess)、异源人工授精(artificial insemination by donor)、无性生殖(asexual reproduction)
[单选题]目前,我国禁止的生殖技术是
A. 人工授精
B. 同源人工授精(artificial insemination by husband)
C. 异源人工授精(artificial insemination by donor)
D. 无性生殖(asexual reproduction)
E. 体外受精