曲线 $y=x(x-1)(2-x)$ 与 $x$ 轴所围图形的面积可表示为
A. $-\int_0^2 x(x-1)(2-x) \mathrm{d} x$
B. $\int_0^1 x(x-1)(2-x) \mathrm{d} x-\int_1^2 x(x-1)(2-x) \mathrm{d} x$
C. $-\int_0^1 x(x-1)(2-x) \mathrm{d} x+\int_1^2 x(x-1)(2-x) \mathrm{d} x$
D. $\int_0^2 x(x-1)(2-x) \mathrm{d} x$