Most of the Europeans refuse to accept GM food________Americans regard it as the fruit from high tech.

A．when

B．as

C．while

D．the moment

人工授精不适合于（）

A.男方无精症

B.男方性功能障碍，治疗无效

C.男方携有不良遗传因素

D.女方宫颈狭窄或有抗精子抗体

E.输卵管结扎术后