练习说明：
周一到周五是16个单词 + 一段翻译（单词做到认识就好，快速记忆多次重复。翻译关注紫色部分的表达，可以进行互译检测：看到中文回忆英文，看到英文回忆中文）
周六真题及其详解，再次巩固词汇体会完形题目
周日文章结构图，可以对照之前的翻译练习再次巩固
前期大家可以多关注单词。
每日词汇
每日翻译
Sure enough, firms' investment and R&D intensity were correlated with the happiness of the area in which they were headquartered. But is it really happiness that's linked to investment, or could something else about happier cities explain why firms there spend more on R&D? To find out, the researchers controlled for various factors that might make firms more likely to invest—like size, industry, and sales—and for indicators that a place was desirable to live in, like growth in wages or population. The link between happiness and investment generally held even after accounting for these things.
这篇完形里面有很多表示相关的表达，大家可以有意识记下。比如：
be correlated with...
be linked to...
the link between
be related to...
同时，相关关系≠因果关系
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