____ in thenewspaper, I didn't notice what was happening.[ ]

A. Having buried    

B. Burying

C. Buried    

D. To be buried

重结晶理想的溶剂是

A．极性溶剂

B．中等极性溶剂

C．弱极性溶剂

D．杂质溶解度随溶剂温度改变而变化较大的溶剂

E．杂质溶解度基本不随溶剂温度改变而改变的溶剂