列举二战后美国经济发展的四个阶段及其特点。

下列反应离子方程式正确的是 [ ]

A．将少量二氧化硫气体通入次氯酸钠溶液中：SO₂+2ClO^-+H₂O＝SO₃^2-+2HClO

B．向苯酚钠溶液中通入二氧化碳：CO₂+H₂O+2C₆H₅O^-→2C₆H₅OH+CO₃^2-

C．向明矾溶液中滴加Ba(OH)₂，恰好使SO₄^2-沉淀完全：2Al³⁺+3SO₄^2-+3Ba²⁺+6OH^-=2Al(OH)₃↓+3BaSO₄↓

D．向氯化铝溶液中投入过量Na：Al³⁺+4Na+2H₂O=AlO₂^-+4Na⁺+2H₂↑

阅读下文并回答问题。

Mr. King is from America. He and his wife are teachers. They teach English in a middle school in Beijing. They have two daughters. They are twins. Their names are Lucy and Lily. They're twelve. They look the same. They are students, but they are in different school. Their family has two bikes and a car. One bike is for Lily, the other is for Lucy. Mr. and Mrs. King go to work in their car. They have many friends in China. They sometimes go to the friends' home for supper（晚餐）.

小题1:Where is Mr. King from?

小题2: How do Mr. and Mrs. King go to work?

小题3: Do Mr. and Mrs. King have many friends in China?

变形缝的作用是保证房屋在( )时能有一些自由伸缩，以防止墙体开裂，结构破坏。

A．温度变化

B．湿度变化

C．大气压变化

D．基础不均匀沉降

E．地震

留取中段尿的正确方法是（）

A.尿量不宜太多，3ml即可

B.尿内勿混有消毒液

C.女性患者须取坐位

D.必须留取晨起第一次尿

E.用干燥试管留取尿液