设图数 $f(x, y)$ 在 $\mathbf{R}^{\circ}$ 上进续, 交抰祭次积分的顺序 $\int_{-2}^1 \mathrm{~d} x \int_{x^2}^{2-x} f(x, y) \mathrm{d} y=$
A. $\int_1^4 \mathrm{~d} y \int_{\sqrt{y}}^{2-y} f(x, y) \mathrm{d} x$.
B. $\int_1^4 \mathrm{~d} y \int_{2-y}^{\sqrt{y}} f(x, y) \mathrm{d} x$.
C. $\int_0^1 \mathrm{~d} y \int_{\sqrt{y}}^{2-y} f(x, y) \mathrm{d} x+\int_1^4 \mathrm{~d} y \int_{2-y}^{\sqrt{y}} f(x, y) \mathrm{d} x$.
D. $\int_0^1 \mathrm{~d} y \int_{\sqrt{y}}^{\sqrt{y}} f(x, y) \mathrm{d} x+\int_1^4 \mathrm{~d} y \int_{-\sqrt{y}}^{2-y} f(x, y) \mathrm{d} x$.