The tiger __________ many _________ of animal for food.
弹:dàn____ tán____
空:kōng____ kòng____
划:huá____ huà____
世界上一半是咸水一半是淡水的湖泊是( )
某人尿糖、口渴、感觉饥饿,且机体逐渐消瘦,经尿检是糖尿病,其患病的根本原因是( )