She wrote ______ second book, which turned out to be still popular with ______ young.

A．the; the

B．a; 不填

C．a; the

D．the; 不填

关于室性期前收缩，下列哪项是错误的

A．症状的轻重与早搏的频发程度不直接相关
B．听诊时，室性期前收缩后出现较长的间歇
C．第一心音强弱不等
D．颈静脉可见巨大α波
E．桡动脉搏动减弱或消失