Ann’s good friend advised her ________ DIY instead of ________ with others about it.

A．take a course on; to discuss

B．to take a course in; discussing

C．to take a course in; discussed

D．take a course in; discuss

丹毒的特征：（）

A．初起有多个粟粒状脓头

B．初起光软无头，红肿疼痛，范围6～9cm

C．初起疮形如粟粒状脓头，坚硬根深

D．初起皮肤片状红斑，边界清楚，压之褪色，抬手即复

E．初起疮形如粟，突起根浅