左心衰竭主要是由于( )
A．心率加快B．体循环静脉淤血C．毛细血管通透性增高D．肺淤血、肺水肿E．心室肥厚
参考答案：D
English ______ in Canada, Australia and New Zealand as well as America and Britain. [ ]
A. speaks
B. is speaking
C. is spoken
D. spoke
主机号各位全为（）的IP地址用于广播之用，叫做直接广播地址。
