2. 外语
  3. The word "demographic" (Line 4, Para. 1) means ______. During the first period of demographic history, societies were often in

The word "demographic" (Line 4, Para. 1) means ______. During the first period of demographic history, societies were often in

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问题 The word "demographic" (Line 4, Para. 1) means ______.
During the first period of demographic history, societies were often in danger of extinction because ______.
选项 A、only one in ten persons could live past 40
B、there was higher mortality than fertility in most places
C、it was too dangerous to have babies due to the poor conditions
D、our ancestors had little enthusiasm for more children
答案B
解析 细节题。由文章第二段倒数第二句可知，在人口统计学历史上的第一个阶段，社会常有覆灭的危险是因为很多地方人口死亡率比出生率高，所以B正确。
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