There is no doubt that holding such____ National Day parade will significantly enhance (提高) ____national pride and self-confidence of Chinese People.

A．a; the

B．a; a

C．the; the

D．the; a

茫茫黑夜中，航标灯为航海员指明了方向。航标灯的电源必须长效、稳定。我国科技工作者研制出以铝合金、Pt-Fe合金网为电极材料的海水电池。在这种电池中 [ ]

①铝合金是阳极  ②铝合金是负极  ③海水是电解质溶液   ④铝合金电极发生还原反应   

A．②③    

B．②③    

C．①③    

D．①④