党的十八大报告中把“生态文明建设”首次提升到更高的战略层面，要求加大自然生态系统和环境保护力度。下列做法不符合这一要求的是  （　　）

A．合理开发洁净能源

B．全面关停化工企业

C．改进汽车尾气净化技术

D．研发易降解的生物农药和塑料

There are two common types in page replacement algorithm : stack and non-stack strategies. When a real page number increase only stack algorithm can increase the hit rate monotonously. In the following replacement algorithm, which one belongs to non-stack strategy

A．FIFO

B．LRU

C．OPT

D．non of above