本文讲述的是人口增长的历史，从公元前8000年到当前人口的增长情况进行分析。

　　5．The underlined word “demographic” in Paragraph 1 means ________.

　　A．extinction of human

　　B．statistics of human population

　　C．death rate of human

　　D．development of human population

　　答案：B　词义猜测题。根据单词所在的句子中compare... to“a long, thin powder fuse that burns steadily and hesitatingly until it finally reaches the charge and explodes”并结合文章话题可知。

　　6．Which of the following demographic growth patterns is most similar to the long thin powder fuse?

　　A．A slow growth for a long time and then a period of rapid, dramatic increase.

　　B．Too many people on earth and a few rapid increases in the number added each year.

　　C．A virtually stable or slightly decreasing period and then a sudden explosion of population.

　　D．A long period when death rates exceed birthrates and then a short period with higher fertility and lower mortality.

　　答案：A　细节理解题。导火线开始平稳燃烧，到最后会达到引爆点而爆炸，而人口的发展亦是如此。

　　7．During the first period of demographic history, societies were often in danger of extinction because ________.

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