DNA分子的基本骨架是
A:通过氢键相互连接的碱基对
B:通过氢键相互连接的核苷酸对
C:交替连接的脱氧核糖和磷酸
D:通过共价键依次相连的脱氧核糖和碱基
判断函数y=﹣1|x|是否属于反比例函数,并说明理由.
The allowance is only enough to________the most fundamental needs such as food and clothing.