(C)

    Hello, boys and girls! My name is Dick. I'm a boy. I'm a robot (机器人). Please look here. These are my hands. My arms are long. I have no hair. This is my face. I have two big eyes, a long nose and a wide mouth. Here are my big ears. ⑶I have short legs and two big 　　 (foot). I can walk(步行). I can speak Chinese, but I can't speak English. I'm your good friend.

某同学在竖直砖墙前的某处水平抛出一石子，初速度方向与墙平行，石子在空中的运动轨迹如图所示．石子恰好垂直打在下方一倾角为30°的斜坡上的A点．已知砖块的厚度均为6cm，抛出点与A点在竖直方向相距30块砖，（g取10m/s²）求

下列关于地球形状的描述，正确的是（　　）