It was getting dark, but the little boy didn’t know______________.

A．who can he ask for help

B．what was wrong with the bike

C．where can he go to mend the bike

D．if he could arrive home on time or not

《中国药典》以蒽醌为控制成分之一的中药材是（）。

A.黄芪

B.斑螯

C.石膏

D.苦杏仁

E.虎杖