2. If the lateral surface development of a cone is a sector with a central angle of $120^{\circ}$ and a radius of $l$, then the ratio of the total surface area to the lateral surface area of this cone is ( ).
A. $3: 2$
B. $2: 1$
C. $4: 3$
D. $5: 3$
2. C. From $2 \pi \gamma=-\frac{2}{3} \pi l$ we get $l=3 \gamma, S_{\text {total }}=\pi \gamma^{2}+\pi \gamma l=4 \pi \gamma^{2}$. $S_{\text {m }}=3 \pi \gamma^{2}$, as required.