The couple tried every effort to      the judges, who tried the cases, of their innocence (清白) only    in the contrary.

A．prove; to result

B．charge; resulting

C．convince; to result

D．confirm; resulting

将药材粉末进行微量升华，镜检可见长柱状、针状、羽状结晶，结晶上滴加三氯化铁醇溶液，结晶溶解而呈暗紫色，该结晶的化学成分是（）

A.大黄素

B.丹皮酚

C.厚朴酚

D.桂皮醛

E.小檗碱