由于发情鉴定不准确和输精技术不熟练而导致的不育属于（）

A.管理利用性不育

B.营养性不育

C.繁殖技术性不育

D.环境气候性不育

E.非传染性疾病不育

_______ the influence of computers, nowhere have we seen the results more clearly than in the US.

A．Besides

B．With

C．Because of

D．As for