A：葵花朵朵向太阳
B：母鸡带领小鸡吃米
C：婴儿听优美的音乐
D：阿尔法狗机器人下棋
With great efforts____ (focus) on the conservation project, the number some rare animals is steadily increasing.
下列图形是中心对称图形的是（ ）
