Today in the United States, adult education facilities face rising demand created by expanding leisure time.

单项选择题Fermi was famous for inventing a device to calculate bomb’s energy accurately.

单项选择题Fermi, an experimentalist as well as a theoretician, won a Nobel Prize for producing the first nuclear chain reaction in the world.

单项选择题Dividing a big problem into small problems is a talent Fermi had and a talent that has practical value in life.

单项选择题Fermi problem is to develop the talent of breaking a seemingly unanswerable problem into sub-problems and finding the solution to it, which is a typical Fermi problem.

单项选择题Then the fourth paragraph tells us how Fermi solved the problem of earth’s circumference without looking up.