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.
【S8】

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答案which前面加to

解析 本题辨析“介词+关系代词”引导的关系分句。当先行词在关系分句中作介词的补足成分时,在正式语体中,要把介词置于关系代词之前,从而产生了“介词+关系代词”引导的关系分句。在这样的关系分句中,要注意两点,一是介词不可以遗漏,二是要考虑介词的搭配,可能是和先行词的搭配,也可能是和动词的搭配。
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