—  ShaU we put off the experiment till next week?    

—      . I don't think our teacher will be happv with it.     [ ]

A. Never mind  

B. Sure, go ahead  

C. Yes, better not

D. I'd rather not

其循环系统的病理生理改变是

A．心功能不全

B．血容量相对过多

C．血容量严重不足

D．容量血管过度收缩

E．以上都不是