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
若S1=∫12x2dx,S2=∫121xdx,S3=∫12exdx则S1S2S3的大小关系为( )
—Excuse me, is this _______ bicycle?
—No, it isn't. _______ is over there under the tree.