下列关于T2噬菌体侵染细菌的系列实验的叙述,正确的是( )A.用标记亲代噬菌体,若充分搅拌,则沉淀物中一定无放射性B.用标记细菌,若检测子代噬菌体的放射性,则子代全部没有放射性C.用标记细菌,若检测子代噬菌体的放射性,则子代全部含有放射性D.用标记亲代噬菌体,若检测子代噬菌体的放射性,则子代全部没有放射性The picture of the park________memories of our class's trip last year, when Mr Smith began to take charge of our class.
[ ]A. called up B. reminded C. turned up D. came up