题型:问答题 简答题 维生素缺乏症:(1)______缺乏时,皮肤粗糙.(2)______缺乏时神经炎,食欲不振,生长迟缓.(3)______缺乏时,抵抗力下降,牙龈出血.(4)______缺乏时,儿童______(如鸡胸、X形或O形腿等)、老年人患______. 查看答案
题型:问答题 简答题 According to the speaker, it is foolish and childish for a filmmaker to mix his preconceptions with objective truth when he produces a documentary. 查看答案