A:阳光→草→昆虫→蛙
B:草→羊→狼
C:朽木→真菌→松鼠
D:黄鼠狼→蛇→田鼠→植物
玉米是一种雌雄同株的植物,其顶端开雄花,中部开雌花.玉米的生命周期包括种子萌发、生长、开花、结果和死亡等阶段.请回答下列问题:
— Dad, I don't think we can go into the building. Look at the sign — “_______”.
— Oh, I didn't notice it.