聚丙烯酰胺凝胶电泳DNA的染色可用（）

A.硝酸银

B.溴酚蓝

C.亚甲蓝

D.台盼蓝

E.麝香草酚蓝

The coming of railway in the 1830s ______ our society and economic life.

A．transformed

B．transported

C．transferred

D．transmitted