2. 外语
  3. Demography is the statistical study of human populations. It can be a general science that can be applied to any kind of

Demography is the statistical study of human populations. It can be a general science that can be applied to any kind of

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问题    Demography is the statistical study of human
   populations. It can be a general science that can be applied
   to any kind of dynamic population, that is, one that changed 【S1】______
   over the time or space. It encompasses the study of the 【S2】______
   size, structure and distribution of populations, and spatial
   or temporal changes in them in response to birth, death,
   migration and ageing.
   Human demography is the most well known of discipline
   demography, and typically what people refer when using 【S3】______
   the term demography. Demographic analysis can be applied to
   whole societies or to groups defined by criterion such as 【S4】______
   education, nationality, religion and ethnicity. In academia,
   demography is often regarded as a branch of either economy 【S5】______
   or sociology. Formal demography limits its object of study
   to the measurement of population processes, when the 【S6】______
   more broad field of social demography studies also analyze
   the relationships between economic, social, cultural and
   biological processes influencing on a population. 【S7】______
   Ibn Khaldun (1332-1406) is regarded as the "father of
   demography" for his economic analysis of social organization
   which produced the first scientific and theoretical work
   on population, development, and group dynamics. At the
   end of the 18th century, Thomas Malthus concluded that,
   if unchecked, populations would be subject to exponential
   growth. He feared that population growth would intend to 【S8】______
   outstrip growth in food production, leading to ever increased 【S9】______
   famine and poverty; he is seen as the intellectual father of
   ideas of overpopulation and the limits for growth. Later 【S10】______
   more sophisticated and realistic models were presented by
   Benjamin Gompertz and Verhulst.
【S3】
选项
答案在refer后面加上to
解析 本题辨析分句中的动词词组。what引导的名词性分句作句子的主语补足语。引导词what实际上充当分句中谓语动词refer to的宾语。如果没有介词to的话，what就是充当refer的宾语，但是refer是不及物动词，所以必须加介词to。如果名词性分句或关系分句的引导词充当分句的介词宾语，那么一定不可以遗漏这个介词。
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