A:图中所示为核糖核苷酸长链
B:2为脱氧核糖
C:4为鸟嘌呤脱氧核苷酸
D:5只能在细胞核中找到
① 9917÷9 ② (677×11)÷(677×11) ③ 6÷12-12÷6
下列实验基本操作中,正确的是( )
— Did you enjoy____ (you) at the concert?
— Yes, I enjoyed ____ (listen) to music all the time.