In the nineteenth century, poor Europeans seeking to make their fortunes turned to America as a matter of course .

A．automatically

B．obviously

C．traditionally

D．resignedly

下列哪种变化最能促使血液成分渗出()

A．小动脉短暂痉挛，血流减少

B．小静脉、毛细血管淤血，血流缓慢

C．小动脉扩张，血流加快

D．组织变质崩解

E．内皮细胞肿胀