胚胎性别鉴定
参考答案：
指利用细胞生物学或分子生物学的方法识别胚体性状，有效控制动物后代性别比例的技术。
1，3，5，9，17，31，57，( )
A．105
B．89
C．95
D．135
25. It is only after my father was long gone _____ understand his deep love for me.
A．I could
B．could I
C．that I could
D．when I could
