We hope that as many people as possible ____join us for the charity show tomorrow.  [ ]

A. need    

B. can    

C. must    

D. shou

大黄精的性状特征有( )

A．呈肥厚肉质的结节块状

B．表面淡黄色至黄棕色，有环节

C．结节上侧茎痕呈圆盘状，周围凹入

D．质硬而韧，不易折断，断面角质

E．气微，味甜，嚼之有黏性