大纲工具栏能实现( )。
A．删除幻灯片
B．添加幻灯片
C．改变幻灯片的顺序
D．改变幻灯片的版式
参考答案：B
Wang Gang is considering buying a computer, _____ is considered to be a great help in our work and study. [ ]
A. as
B. which
C. that
D. what
精制豆油在静脉注射脂肪乳剂中的作用是（）.
A．油相
B．乳化剂
C．等渗调节剂
D．pH调节剂
E．抑菌剂
