近代中国，“赶火车…‘赶轮船…‘赶汽车”成为新的社会俗语。这一现象出现的原因有  

①西方工业文明的影响 ②人们生活节奏的加快  

③新式交通工具运行时间相对固定 ④社会生产和生活的需要     [ ]

A． ①②③     

B．②③④     

C．①③④     

D．①②④

I become ________ in American history.

A．more interested and more interested

B．more and more interested

C．more interesting and more interesting

D．more and more interesting