Question 23 is based on the recording you have just heard.

原文：

M: From a very early age, some children exhibit better self-control than others. (23)Now, a new study that began with about 1,000 children in New Zealand has tracked how a child's low self-control can predict poor health, money troubles and even a criminal record in their adult years. Researchers have been studying this group of children for decades now. Some of their earliest observations have to do with the level of self-control the youngsters displayed. Parents, teachers, even the kids themselves, scored the youngsters on measures like "acting before thinking" and "persistence in reaching goals." The children of the study are now adults in their 30s. Terrie Moffitt of Duke University and her research colleagues found that kids with self-control issues tended to grow up to become adults with a far more troubling set of issues to deal with.

W: The children who had the lowest self-control when they were aged 3 to 10, later on had the most health problems in their 30s, and they had the worst financial situation. And they were more likely to have a criminal record and to be raising a child as a single parent on a very low income.

M: Speaking from New Zealand via skype, Moffitt explained that self-control problems were widely observed, and weren't just a feature of a small group of misbehaving kids.

W: Even the children who had above-average self-control as pre-schoolers, could have benefited from more self-control training. They could have improved their financial situation and their physical and mental health situation 30 years later.

M: So, children with minor self-control problems were likely as adults to have minor health problems, and so on. Moffitt said it's still unclear why some children have better self-control than others, though she says other researchers have found that it's mostly a learned behavior, with relatively little genetic influence. But good self-control can be set to run in families in that children who have good self-control are more likely to grow up to be healthy and prosperous parents.

W: Whereas some of the low-self-control study members are more likely to be single parent with a very low income and the parent is in poor health and likely to be a heavy substance abuser. So that's not a good atmosphere for a child. (24)So it looks as though self-control is something that in one generation can disadvantage the next generation.

M: (25)But the good news is that Moffitt says self-control can be taught by parents and through school curricula that have proved to be effective. Terrie Moffitt's paper on the link between childhood self-control and adult status decades later is published in the Proceedings of the National Academy of Sciences.

23 What is the new study about?

解析：C四个选项均为概括性名词短语，推测题目可能和主题相关。需要根据整体对话进行概括。对话一开始引入新西兰的一项研究，该研究探究了孩子自制力差是如何预示其成年后健康状况差、经济拮据甚至犯罪的，之后的对话对研究方法和结果进行了详细阐述。故C选项“孩子自制力和其未来成功之间的关系”为正确答案。A选项“孩子学习成绩的决定性因素”、B选项“单亲家庭长大的孩子的健康问题”、D选项“新西兰孩子自制力强的原因”均不是该研究的内容，排除。