一Why are you ready ________ Jour study in America?

一Because English is spoken ________ the first language there. [ ]

A. to; by

B. for; as

C. to; as

D. for; by

关于显影的叙述，错误的是

A．全部为化学显影

B．显影途径分物理显影和化学显影

C．物理显影与化学显影原理是一样的

D．将潜影转换成可见银影的化学反应过程

E．化学显影把乳剂中的Ag⁺作为还原银的来源