When the students heard the good news, they jumped _______ in the classroom. [ ]

A. here and there

B. up and down

C. now and then

D. front and back

氢氧化钠固体俗称______、______、______，在空气中易吸收______而潮解，还能吸收______而变质，所以氢氧化钠必须______保存．氢氧化钙俗称______、______，它______溶于水，它的饱和溶液是______（填“浓”、“稀”）溶液，它的溶解度随温度的升高而______．工业上常用生石灰和水反应制得，该反应的化学方程式是______．