The development of human culture, after the late Paleolithic period, has entered the Neolithic and metal ages . It has been no more than 10,000 years from the Neolithic age to the present, and it has been thousands of years since the metal age. For more than a hundred years, the use of atomic energy is only a matter of recent decades, and the development stage before the Neolithic period was hundreds of thousands to millions of years. The most accurate understanding of the above paragraph is:. ['The development of human culture is not a constant-speed movement, but is similar to an accelerated movement. The later, the speed of advancement will increase exponentially.', 'The development of human culture is slow. This is an objective existence and is not transferred by human will.', 'The metal age is a key period in the history of human culture. Since then, electricity and atomic energy have been widely used, which has rapidly promoted the development of human society.', 'The different stages of human culture development vary in length of time, some take hundreds of thousands of years, and some take only a few decades.']