Educational attainment in rural America reached a historic height in 2000, with nearly one in six rural adults holding a 【M1】__

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问题   Educational attainment in rural America reached a historic
height in 2000, with nearly one in six rural adults holding a  【M1】______
4-year college degree, and more than three in four complete 【M2】______
high school. As the demand of workers with higher educational  【M3】______
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. 【M4】______
  First, does a better educated population lead to greater
economic growth? According to a recent study, rural counties
with higher educational levels saw rapid earnings and  【M5】______
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 urban areas. 【M6】______
Second, are there Ways to improve local educational attainment,
particularly through improvements in elementary and high
schools, It can enhance the economic well-being of rural   【M7】______
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 【M8】______
small rural counties lose young adults through
outmigration. The loss of potential workers from rural areas, as
young adults leave college and work opportunities in urban 【M9】______
areas, has concerned rural observers for many decades. This
rural "brain drain" not only deprives rural employers of an
education workforce, but also depletes local resources because 【M10】______
communities that have invested in these workers’ education
reap little return on that investment.
【M7】

选项

答案it改成that。

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。
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