A.It is difficult for people living in a Stone Age culture to move into a modern world.B.Invention is a new idea to modern people.C.We human beings have abilities to solve such problems as war and pollution.D.What we need is demands from others to work for a better future.
A.It is difficult for people living in a Stone Age culture to move into a modern world.
B.Invention is a new idea to modern people.
C.We human beings have abilities to solve such problems as war and pollution.
D.What we need is demands from others to work for a better future.