题目

The car ____ at the present speed until it reaches the foot of the mountain at about nine o’clock tonight. A、went B、is going C、goes D、will be going   答案：D14．已知SC是球O的直径，A，B是该球面上的两点，△ABC是边长为$\sqrt{3}$的正三角形，若三棱锥S-ABC的体积为$\sqrt{3}$，则球O的表面积为（　　）A．16πB．18πC．20πD．24π