A:核苷酸合成核酸
B:蔗糖分解成二分子葡萄糖
C:淀粉分解成葡萄糖
D:氨基酸合成血红蛋白
①山岛竦峙:____
②幸甚至哉:____
③客路青山外:____
④海日生残夜:____
The students stopped talking__________ the teacher came into the classroom.