流痰的病因病机主要有（）
A.儿童先天不足
B.肾气不充骨骼柔嫩脆
C.强令早坐
D.骨质疏松
E.跌仆损伤，再复感邪气
参考答案：A, B, C, E
---The Bird's Nest, isn't it?
---Yes. It's ___________we visited during our stay in Beijing.
A．where
B．what
C．when
D．That
中国特色社会主义最本质的特征是（）。
A、党的领导
B、人民民主专政
C、公有制
---Yes. It's ___________we visited during our stay in Beijing.