题干
The beach is so beautiful that it is worthwhile, I think, _____ for a short holiday.
A：of going
B：to be going
C：your going
D：you to go
答案(点此获取答案解析）
C
A：of going
B：to be going
C：your going
D：you to go
S标记的氨基酸培养哺乳动物乳腺细胞，测量细胞合成并分泌乳腺蛋白过程中各种膜结构的面积变化，结果如图。a、b、c，所代表的膜结构名称以及放射性标记出现的先后顺序是