About _______ gene-targeting drugs are already in testing pipeline. It won’t be long ______ they are put into effect.

A．two dozen; before

B．two dozens; that

C．two dozens of; before

D．dozens; that

“素胚勾勒出青花笔锋浓转淡，瓶身描绘的牡丹一如你初妆……在瓶底书刻隶仿前朝的飘逸……色白花青的锦鲤跃然于碗底，临摹宋体落款时却惦记着你……”周杰伦演唱的《青花瓷》以其浓厚的中国风也深受观众朋友的喜爱。你知道哪个朝代烧制的青花瓷被人们奉为珍品？ [ ]

A．唐朝

B．宋朝

C．明朝

D．清朝