Paper cuts which show the Chinese character for double happiness are often used ________ weddings.

A．to celebrating

B．to celebrate

C．celebrating

D．celebrate

典型的低血容量休克的血流动力学指标的变化可能有（）。

A.BP↓，HR↑，CO↓，SVR↑，CVP↓

B.BP↓，HR↑-↓，CO↓，SVR↑，CVP↑

C.BP↓，HR↑，CO↑-↓，SVR↑-↓，CVP↑

D.BP↓，HR↑，CO↓，SVR↓，CVP↓-↑

E.BP↑，HR↑，CO↓，SVR↑，CVP↓