所谓合金，就是不同种金属（也包括一些非金属）在熔 化状态下形成的一种熔合物或冷却后的固体，下表中的金属难与表中其他金属形成合金的是 

A．Fe、Ag

B．W、Ag

C．Ag、Zn

D．Zn、W

________of his childhood home in Hannibal, Missouri, provided Mark Twain with the inspiration for two of his most popular novels.

A．Remembering

B．Memories

C．It was the memories

D．He remembered