Reading comprehension
Since 1750, about the beginning of the Age of Steam, the earth’s population has more than tripled. This increase has not been an
evolutionary phenomenon with biological causes. Yet there was an evolution—it took place in the world’s economic organization. Thus
1,500,000,000 more human beings can now remain alive on the earth’s surface, can support themselves by working for others who in turn
work for them. This extraordinary tripling of human population is explained by the speeded-up economic unification which took place
during the same period. Thus most of us are now kept alive by this vast cooperative unified world society. Goods are now the great
travelers over the earth’s surface, far more than human beings. Endless streams of goods crisscross, as on Martian canals, with hardly an
inhabited spot on the globe unvisited.
【題組】
Which of the following is the best title for the passage?
(A) The Age of Steam.
(B) Notable Biological Phenomena.
(C) World-wide Population Increase.
(D) Global Economic Interdependence.