阅读题型在大学英语六级中占有相当大的比重,阅读的分数却不是那么容易拿全。攻克阅读难题,除了技巧之外,还需要大量的练习,在不断的练习中灵活运用技巧,提升阅读能力。
We can begin our discussion of population as global issue with what most persons mean when they discuss the population problem: too many people on earth and a too rapid increase in the number added each year. The facts are not in dispute, It was quite right to employ the analogy that likened demographic growth to a long, thin powder fuse that burns steadily and haltingly until it finally reaches the charge and explodes.
To understand the current situation, which is characterized by rapid increases in population, it is necessary to understand the history of population trends. Rapid growth is a comparatively recent phenomenon. Looking back at the 8,000 years of demographic history, we find that populations have been virtually stable or growing very slightly for most of human history. For most of our ancestors, life was hard, often nasty, and very short. There was high fertility in most places, but this was usually balanced by high mortality. For most of human history, it was seldom the case that one in ten persons would live past forty, while infancy and childhood were especially risky periods. Often, societies were in clear danger of extinction because death rates could exceed their birthrates. Thus, the population problem throughout most of history was how to prevent extinction of the human race.
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