In Patton City, days are categorized as having heavy rainfall (more than two inches),moderate rainfall (more than one inch, but no more than two inches), light rainfall (at least a trace, but no more than one inch), or no rainfall. In 1990, there were fewer days with light rainfall than in 1910 and fewer with moderate rainfall, yet total rainfall for the year was 20 percent higher in 1990 than in 1910.
If the statements above are true, then it is also possible that in Patton City
A. the number of days with heavy rainfall was lower in 1990 than in 1910
B. the number of days with some rainfall, but no more than two inches, was the same in 1990 as in 1910
C. the number of days with some rainfall, but no more than two inches, was higher in 1990 than in 1910
D. the total number of inches of rain that fell on days with moderate rainfall in 1990 was more than twice what it had been in 1910
E. the average amount of rainfall per month was lower in 1990 than in 1910
已知：heavy rainfall > 2 inches; 2>=moderate rainfall > 1; 0
且 1990年小雨和中雨的天數都比1910少，然而1990年全年的降雨量還比1910多，那就只能是1990年的大雨天數比1910多，一般我們都會這樣的預估，但選項恰恰沒有該項。迷茫中，看到了D，誤以為找到了救星，正好落在了出題者的陷阱之中。
細看該題所問“If the statements above are true, then it is also possible that in Patton City”，原來並非是由原文推出選項的匯出題，而是一道怪題;只要是“可能的”項就是正確的。換句話說，依據原文，有四個選項是絕不可能的'，只有一個是可能的。
那再看D，在1990年中雨天數比1910少的情況下，其降雨量可以超過1910的2倍嗎?絕不可能 ------ 因為2>=moderate rainfall > 1，即最大的中雨量不超過最小的中雨量的2倍，也就是：即便1990的中雨天每次都是最大量，而1910的中雨量每次都是最小量，那麼D都不能成立。
而B與C明顯與已知條件矛盾(“1990年小雨和中雨的天數都比1910少”)
而E與“1990年全年的降雨量還比1910多”衝突
看來也就A有希望了;但A與我們的預估相反。
但A的確是可能的，說個最極端的情況，1990年只下了一天雨，那是一場萬年不遇的億寸豪雨，其降雨量可以遠遠超過1910年的天天小雨、中雨或大雨。一天就超過365天這有什麼不可能的呢?
通過上述的GMAT邏輯試題詳解，相信大家已經發現GMAT邏輯試題難就難在它並沒有標準答案，你需要對各個選項進行分析，選出其中相對而言最為正確的答案。
