A:What did you do yesterday?
B:What do you do yesterday?
C:What did your mum do yesterday?
把①蔗糖,②淀粉,③纤维素,④乙酸乙酯在稀硫酸存在下分别进行水解,最终产物只有1种的是( )
显性基因用____表示,隐性基因____表示。