求助涛涛29-35

mandyuuqq

Q35:

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

 

1. the number of days with heavy rainfall was lower in 1990 than in 1910
2. the number of days with some rainfall, but no more than two inches, was the same in 1990 as in 1910
3. the number of days with some rainfall, but no more than two inches, was higher in 1990 than in 1910
4. 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
5. the average amount of rainfall per month was lower in 1990 than in 1910

答案是A， 但我觉得不充分， 三种雨都少于1910， 怎么会1990 比1910 多五分之一呢

我选的是D. 是从雨量上考虑的。 请指正。  谢谢

renprincer

同学，下雨的天数，和降雨量是两个概念呢。

mandyuuqq

这我知道，但怎么理解这题呢

请指教

小巧玲珑

偶也是看了N遍的一个题，终于明白了。

BC是最容易排除的，偶一开始也在这两个上面打转，但题干已经给出了中雨和小雨的天数1990年比1910年短，选项又说这两种雨的天数“一样”和“长于1910”，正好和原文直接矛盾，如果把不下雨的天数也绕进去了，当然出不来了。

E错的也很明显，原文最后说“1990年总雨量大”，而E说“1990的总雨量小”，注意：E这里没有用“下雨的天数”（DAYS），而是amount of rainfall 和原文中的total rainfall完全对应，错的干净利落。

至于D，有点迷惑，有点像数学的DS题，这是前人关于D的两个解释:偶觉得说的比较清楚

这是前人关于D的两个解释:偶觉得说的比较清楚

设一个极端的数字：两个年份最接近的天数是差一天。1990年下了364天，1910年下了365天分别取上下限。1990年为728，1910年为365，两者比率为1.99，也就是永远不可能超过2倍。

also possible = CANNOT BE TRUE EXCEPT(对题目的理解也很重要)

moderate rainfall (more than one inch >1, but no more than two inches ≤ 2).

A>1, B≤2. B永远不可能是A的两倍, 即CANNOT be true.

 

最后说A,A的关键是：大雨是没有上限的。天数少，但是可能每天雨量都超过100,下了300天,而以前的大雨也只不过是21,所以A是有可能.

 

说句题外话,如果A给成"1990年的大雨天数比1910多"你希望遇到这种题吗？题库里也许有这种答案，但如果考试真是给出这样答案的话，是不是说明前面错的太多了呢？这种考试的判分模型表明：遇到难题不一定是坏事。要有信心