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  3. Back in the day, a good report card earned you a parental pat on the back, but now it could be money in your pocket. Experiments

Back in the day, a good report card earned you a parental pat on the back, but now it could be money in your pocket. Experiments

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问题     Back in the day, a good report card earned you a parental pat on the back, but now it could be money in your pocket. Experiments with cash incentives(激励)for students have been catching on in public-school districts across the country, and so has the debate over whether they are a【C1】_____tool for hard-to-motivate students.
    According to a study【C2】_____today by the social-policy research group MDRC, a non-profit organization, cash incentives combined with counseling offered "real hope" to low-income and nontraditional students at two Louisiana community colleges.
    The program【C3】_____by the Louisiana Department of Social Services and the Louisiana Workforce Commission was simple: enroll in college at least half-time,【C4】_____at least a C average and earn $1,000 a semester for up to two terms. Participants, who were randomly【C5】_____, were 30% more likely to register for a second semester than were students who were not offered the supplemental financial【C6】_____. And the participants who were first offered cash incentives in spring 2004—and thus whose progress was tracked for longer than that of subsequent groups before Hurricane Katrina【C7】_____forced researchers to suspend the survey for several months in August 2005—were also more likely than their peers to be enrolled in college a year after they had finished the two-term program.
    Students offered cash incentives in the Louisiana program earned more【C8】_____and were more likely to attain a C average than were nonparticipants. And they showed psychological【C9】______too, reporting more positive feelings about themselves and their abilities to【C10】_____their goals for the future.
A)maintain B)brilliant C)cooperative D)claim
E)aid F)selected G)retain H)abruptly
I)credits J)fulfilled K)benefits L)accomplish
M)released N)naturally O)funded
【C5】
选项
答案F
解析 此处应为动词的过去分词形式，与空前的were构成被动语态。根据空前的randomly可知此处应该表示参与者被随意“挑选”，只有selected符合句意。
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