It is difficult for us to explain phenomena of which we have little or______direct knowledge.

A．not any

B．no

C．none

D．nothing

可用于治疗心脑血管疾病的药物不包括（）

A.银杏叶泡腾片

B.通心络胶囊

C.补心气口服液

D.泰脂安胶囊