By no means      true that all native speakers of English know their own language very well．

A．is that

B．that is

C．is it

D．it is

下列有关注射剂叙述错误的是( )

A．中药注射剂系指从药材中提取的有效物质为原料制成的注射剂
B．可分为溶液型、无菌粉末、混悬型、乳浊型注射剂
C．中药注射剂药效迅速，作用可靠
D．注射时疼痛小、安全
E．适用于不能口服给药的病人