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段1：④This has created “a paradox” in that recruiting first-generation students, but then watching many of them fail, means that higher education has “continued to reproduce and widen, rather than close” an achievement gap based on social class, according to the depressing beginning of a paper forthcoming in the journal Psychological Science.
段2：①But the article is actually quite optimistic, as it outlines a potential solution to this problem, suggesting that an approach (which involves a one-hour, next-to-no-cost program) can close 63 percent of the achievement gap (measured by such factors as grades) between first-generation and other students.
27. The authors of the research article are optimistic because .
[A] their findings appeal to students
[B] the recruiting rate has increased
[C] the problem is solvable
[D] their approach is costless
答案：C
问：27题C选项是对如下哪项的同义改写？
A : recruiting first-generation students
B : continued to reproduce and widen an achievement gap
C : it outlines a potential solution to this problem
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