严重出血的急性白血病患者最危险的是()
A.头痛,呕吐
B.眩晕,耳鸣
C.突然腹痛
D.视力减退
E.肉眼血尿
参考答案:A
We have done things we ought not to have done and_____ undone things we ought to have done.
A.left
B.leave
C.will leave
D.leaving
番茄中红果、黄果是一对相对性状,D控制显性性状,d控制隐性性状,如下图所示,根据遗传图解回答下列问题:
F1黄果植株自交后代表现型是(),基因型是()。