题型分类：事实信息题
题干分析：关键词benefits，early intervention programs；根据关键词定位到第五段最后三句 Of course, not every program produced all these benefits, and not every child benefited to the same extent, Furthermore, some researchers argue that less-expensive programs are just as good as relatively expensive ones, such as Head Start. Still, the results of the evaluation were promising, suggesting that the potential benefits of early intervention can be substantial. 大意是：不是每个项目都提供了所有这些益处，不是每个孩子都同样程度地受益。另外，有研究人员说便宜的项目也有类似的效果，如HS。无论如何早期教育的潜在益处都很大。
选项分析：
D选项：对应原文中的and not every child benefited to the same extent部分，正确。
A选项：文中未明确说长期短期的益处，但是根据推断，gains in emotional or cognitive development, better educational outcomes, increased economic self-sufficiency, reduced levels of criminal activity, and improved health-related behaviors这些都是长期益处，故该选项错误。
B选项：和原文Furthermore, some researchers argue that less-expensive programs are just as good as relatively expensive ones相悖。
C选项：原文只是用HS项目做了便宜项目的一个例子，没说HS或是便宜项目比贵的更好，属于无中生有。