--- You have moved again? Would you please let me know your _______ address ?

--- No problem.

A．concrete

B．appropriate

C．typical

D．flexible

若不断地升高温度，实现“雪花→水→水蒸气→氧气和氢气”的变化。在变化的各阶段被破坏的粒子间的相互作用依次是           

A．氢键；分子间作用力；共价键

B．氢键；氢键；共价键

C．氢键；共价键；分子间作用力

D．分子间作用力；氢键；共价键