—What did Alice say? —She said she me at eight o'clock tomorrow morning.
A:is calling
B:was calling
C:will call
D:would call
某音响电路的简化电路图如图所示,输入信号既有高频成分,也有低频成分,则( )
与呼吸作用有关,为细胞的生命活动提供能量的是( )