综合对下列两幅图片的理解，可以说明的最佳主题是
A．春秋争霸
B．战国争雄
C． * * 分立
D．秦的统一
答案：D
_____ reasonable, the idea he _____ to create a friendly environment attracted much public attention. [ ]
A. Sounded; came about
B. Sounded; came across
C. Sounding; came up with
D. Sounding; came along
维生素是鱼类生长发育期必须的物质，体内缺乏（）不利于钙磷的吸收。
A.维生素A
B.维生素B
C.维生素C
D.维生素D
