下列哪组材料全部为片剂中常用的填充剂（）

A.淀粉、糖粉、微晶纤维素

B.淀粉、HPMC、CMS-Na

C.淀粉、糖粉、糊精

D.L-HPC、糖粉、糊精

E.硫酸钙、微晶纤维素、乳糖

A good listener takes part in the conversation,offering ideas and ___ questions to keep the talk flowing.

A．raising

B．understanding

C．copying

D．solving