He had intended to do some physics homework during the play, but he soon _____ the play so much that he

forgot all about the homework. [ ]

A. busied himself enjoying 　　　　

B. involved himself to enjoy 　　

C. found himself enjoying　　　　　

D. convinced himself to enjoy

国际粮价在高位运行，为了确保城镇低收入居民的生活水平不下降，国家作出决策，抛售“临时储备粮”，有效地引导和稳定了国内市场。从辩证唯物论这表明：

A．物质决定意识，意识能够反作用于客观事物

B．意识是客观世界的反映

C．政策是事物发展的源泉和动力

D．树立创新意识是唯物辩证法的要求