A:③④
B:①②③④
C:①③④
D:全部
治疗白化病、苯丙酮尿症等人类遗传病的根本途径是( )
— Is the gray shirt Mr. Zhou's?
— I it is his. His is white.
按照右图装置,瓶内盛放下列何种物质时,灯泡不发光( )