改错
When the bear gets something to eat, it'll nod its head happy.
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调查发现小型湖泊中的绿藻、蓝藻是露斯塔野鲮鱼和罗氏沼虾的食物,罗氏沼虾又是露斯塔野鲮鱼的食物.下列有关叙述不正确的是( )