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
— Hey! Lucy! Have you heard about the optional courses this year?
— _______ .What about that?
A．Not really
B．Not exactly
C．Not simply
D．Not nearly
阑尾连于（）
A.盲肠下端
B.盲肠后壁
C.盲肠内侧壁
D.盲肠后内侧壁
E.盲肠前壁
