2. 外语
  3. Educational attainment in rural America reached a historic height in 2000, with nearly one in six rural adults 【S1】______

Educational attainment in rural America reached a historic height in 2000, with nearly one in six rural adults 【S1】______

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问题    Educational attainment in rural America reached a
   historic height in 2000, with nearly one in six rural adults 【S1】______
   holding a 4-year college degree, and more than three in four
   complete high school. 【S2】______
   As the demand of workers with higher educational 【S3】______
   qualifications rises, many rural policymakers have come to
   view local educational levels as a critical determinant of job
   and income growth in their communities. But policymakers
   are facing with two key questions. 【S4】______
   First, does a better educated population lead to
   greater economic growth? According to a recent study,
   rural counties with higher educational levels saw rapid 【S5】______
   earnings and income growth over the past two decades than
   counties with lower educational levels. However, economic
   returns to education for rural areas continue to lag that for 【S6】______
   urban areas. Second, are there ways to improve local
   educational attainment, particularly through improvements
   in elementary and high schools, it can enhance the 【S7】______
   economic well-being of rural residents and communities?
   In fact, preliminary research demonstrates a connection
   between better schools and positive outcomes in terms of
   earnings and income growth for rural workers and rural
   communities.
   Ultimately, the strength of the tie between education
   and economic outcomes is influenced in part by the
   extent which small rural counties lose young adults through 【S8】______
   outmigration. The loss of potential workers from rural
   areas, as young adults leave college and work opportunities 【S9】______
   in urban areas, has concerned rural observers for many
   decades. This rural "brain drain" not only deprives rural
   employers of an education workforce, but also depletes 【S10】______
   local resources because communities that have invested
   in these workers’ education reap little return on that
   investment.
【S7】
选项
答案it改成which
解析 本题辨析关系分句。本题的关键在于看出用逗号连接两个分句are there ways to improve local educational attainment和it can enhance the economic well-being of rural residents and communities是不符合语法规则的。It指代的恰恰是前一个分句中的名词词组local educational attainment，所以可以用一个关系分句把两者连接起来，考虑到句中有逗号，应为非限制性定语从句，指物则用which。
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