将从大肠杆菌细胞中提取到的核酸彻底进行水解，直至形成不能再水解的小分子，则能得到的小分子的种类共有[ ]
A．9种
B．8种
C．6种
D．4种
答案：B
— Guess yesterday.
— I think you went to see the movie The Lion King.
A．where did I go
B．when I did it
C．what did I do
D．what I did
