—Mum，I am afraid I won’t do well in the coming test.

—Honey，________more careful，________you will make it.

A．is；so

B．be；and

C．be；then

D．being；and

确定苷键构型，可采用（）。

A.乙酰解反应

B.分子旋光差（Klyne法）

C.弱酸水解

D.碱水解

E.强酸水解