The human race has experienced a consistent increase in population since the beginning of its history. Famine and disease have done little to offsetthis steady increase. Too many people are added annually to the population of the world. So both the causes of population increase and the results of having more people are worth careful study.
Culture evolution is the major factor responsible for population increase. Early in human development, people invented tools to hunt animals. Later they built shelters to protect themselves. Step by step, they made life easier. As a result, fewer died from natural forces, such as harsh climate and disease.
In the past, when population grew, there was unexplored territory to inhabit. But now, almost all the habitable land has been explored.
The worlds population may reach 8.7 billion in 2033. It is clear that world population is a serious issue that needs careful attention. Human beings are unique to solve problems through cultural evolution. Facing the world population explosion in the near future. We must carry out the birth control program in order to save the mankind and save the world.
现在进行时代替将来时
表示“据说”“相信”的词组
时态与时间状语
try doing/to do的区别
分词作状语的语法应用
分词作补语的语法应用
短语动词的被动语态形式
过去进行时的应用
一般现在时代替进行时
With的复合结构作独立主格
用一般过去时代替完成时的应用
be going to / will的区别
过去分词作宾语补足语的语法解析
一般现在时的用法
将来进行时的应用
分词作插入语的语法应用
一般现在时表将来的情况
分词的时态
用现在进行时表示将来的用法
begin(start) doing/to do的区别
动词let的用法
时态一致的语法应用
延续动词与瞬间动词的区别
分词的语态
一般将来时的用法
一般现在时代替完成时
since的四种用法
一般过去时的用法
since和for的区别
现在进行时的应用
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