_______ is known to us all is that Madame Curie, _______ life was devoted to science, won

the Nobel Prize twice.

A．As; whom

B．What; whose

C．It; whom

D．That; whose

有关氢原子光谱的说法正确的是(　　)

A．氢原子的发射光谱是连续的

B．氢原子光谱说明氢原子只发出特定频率的光

C．氢原子光谱说明氢原子能级是分立的

D．氢原子光谱的频率与氢原子能级的能量差无关