下列关于脱氧核苷酸各成分间的连接关系,正确的是[ ]
A.磷酸―脱氧核糖―碱基
B.磷酸―核糖―碱基
C.磷酸―碱基―脱氧核糖
D.脱氧核糖―磷酸―碱基
答案:A
a4-16分解因式是______.
It is worth considering what makes" convenience" foods so popular, and______better ones of your own.
A. introducesB. to introduceC. introducingD. introduced