()的原理是生物从无到有、从简单到复杂、从低级到高级的演化是不可逆转的，故不同地质时代的地层含有不同的化石及其组合，而相同时代相同环境下形成的地层则含有相同的化石。

Some are worried about the cyber-industrial complex in thatA．it is a duplicate of the military-industrial complex.B．the possible intimate link will pose potential risks.C．private and public sectors will conspire to monitor them.D．they will be deprived of the right to the freedom of speech. 点击查看答案

One reason why the cyber-industrial complex should be welcomed is thatA．it can create more job opportunities in America.B．it can enhance industrialization of IT researches.C．it is a good way to combat online security threats.D．it can prevent scandals like the Snowden incident. 点击查看答案