There is, however, a significant 27 between such beliefs and the actual effect of weather on people’s performance at work.
答案：(A) gap
however 標示轉折，本句要說的是「一般人的認知」與「天氣對工作表現的實際影響」之間存在明顯落差，故用 gap；link（關聯）方向相反，clue（線索）、ratio（比例）語意不合。
看到 between A and B，你的第一個反應大概是「這兩者有關聯」，於是選 link——但這一題的方向剛好相反，作者要說的是「兩者對不起來」。a gap between A and B 是「A 與 B 之間的落差」，正是研究文章最愛用的句型：先講大家怎麼想，再講事實如何，中間就是一道 gap。
作答線索在前一句 Interestingly, many people believe that bad weather can reduce productivity and efficiency.（有趣的是，許多人相信壞天氣會降低生產力與效率）。本句中間插了 however，句中的 such beliefs 也直接指回前一句的「相信」；既然有 however 標示轉折，接下來要說的必然是「事實並非如此」，認知與實際之間就是一道落差，填 gap。看到 however、in fact、yet、on the contrary 這類連貫標記，先假設這一句要推翻前一句，再把選項填進去看語意方向對不對得上——這一步可以避免只看見 between A and B 就選「關聯」。文末 workers are actually most productive when the weather is lousy（天氣差的時候，工作者的產出反而最高）也印證了這道落差確實存在。
link 是「關聯」，若填進去會變成「認知與實際之間有明顯關聯」，與 however 自相矛盾；clue 是「線索」，不與 between 搭配成這種句型；ratio 是「比例」，用於數量對比（a ratio of 2 to 1），與抽象的認知落差無關。
a gap between A and B（A 與 B 之間的落差）、bridge／close the gap（弭平落差）、the generation gap（代溝）、a link between A and B（A 與 B 的關聯）。
Research has proven that weather plays a part in our moods: Warmer temperatures and exposure to sunshine increase positive thinking, whereas cold, rainy days bring anxiety and fatigue. 26 , many people believe that bad weather can reduce productivity and efficiency.
There is, however, a significant 27 between such beliefs and the actual effect of weather on people's performance at work. Using empirical data from laboratory experiments 28 observations of a mid-sized Japanese bank in real life, researchers find that weather conditions indeed influence a worker's focus. When the weather is bad, individuals tend to focus more on their work rather than thinking about activities they could 29 outside of work. But photos showing outdoor activities, such as sailing on a sunny day or walking in the woods, can greatly distract workers and thus 30 their productivity.
The findings conclude that workers are actually most productive when the weather is lousy—and only if nothing reminds them of good weather.