向盐酸和氯化钙的混合溶液中逐滴滴加碳酸钠溶液，反应现象是 [ ] A．只看到有大

辽宋夏金这一历史时期的政治特点是[ ]

A、繁荣与开放      

B、大一统

C、闭关锁国        

D、民族 * * 并立

根据括号中所给的汉语写出单词，使句子意思完整正确。

1. These years it seldom snows in _____ (冬季) in Nanjing.

2. Don't always make your parents do this or that. Nick.You can do it _____ (自己).

3. Susan usually has some pieces of ______ (面包) and a bottle of milk for breakfast.

4. John is ______ (幸运的) enough to be chosen for the school football team.

5. If we don't protect the animals, We will be _______ (不能) to see them in the future.

用于鉴别生物碱的试剂是（）

A.碘化铋钾

B.碱性苦味酸

C.α-萘酚-浓硫酸

D.硫酸铜

E.浓硝酸

饮片以60%乙醇，采用渗漉法、浸渍法或回流法制成提取物而制成的颗粒是（）

A.水溶性颗粒剂

B.酒溶性颗粒剂

C.混悬性颗粒剂

D.泡腾颗粒剂

E.块状颗粒剂

阴阳属性的征兆是

A．寒与热
B．水与火
C．上与下
D．明与暗
E．动与静