一粒玉米的胚乳的基因型为Aaa,那么此种子胚细胞和父本的基因型分别是 [ ]
A.AA和Aa
B.Aa和AA
C.Aa和Aa(或AA)
D.都只能是Aa
答案:C
一般情况下,肝移植术后肝功能可迅速改善至正常的时间是()
A.术后6~12小时
B.术后12~24小时
C.术后24~36小时
D.术后36~72小时
E.术后72~96小时
—What is your mother?
—__________.[ ]
A. She is my mother
B. She is a policeman
C. She is a nurse