下列流域中，水资源丰富，并且有明显的年际变化的是（）

A、Select * From STUDENT Where Sdept = "计算机工程" or Gender="女"
B、Delete From STUDENT Where Sdept like "计算机%" and Gender="女"
C、Select * From STUDENT Where Sdept= "计算机工程" and Gender="女"
D、Update STUDENT Set Sdept="计算机工程" Where Gender="女"

A.55%
B．50%
C．58%
D．60%