下图为某区域海平面等压线(单位:hPa)分布图,图中陆地大气活动中心达到一年内最强大的季节。读图回答下列问题。
-- It's snowing. I really want to run outside and make a snowman.
-- Why not have a snow ball fight instead? It's more exciting.
①将△ABC沿y轴正方向平移3个单位得到△A1B1C1,画出△A1B1C1,并写出点B1坐标;
②画出△A1B1C1关于y轴对称的△A2B2C2,并写出点C2的坐标.
名著阅读,按要求答题。