【名词&注释】
平均年龄(average age)、人口老龄化(population aging)、供水系统(water supply system)、体外受精(in vitro fertilization)、细菌性痢疾(bacillary dysentery)、密切接触(close contacts)、非老年人(non-senile)、人口总数(total population)、同源人工授精(artificial insemination by husband)、异源人工授精(artificial insemination by donor)
[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
E. 体外受精