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,我知道一定跟heavy rainfall 有关，但是不是应该higher than 1910才能说明文中的么？

如果light,moderate,heavy都少的话。。total rainfall怎么会多内？

amount of day doesnot mean the amount of rain

If one day rains the heaviest rain in this century than the result listed in the arg is possible ,too

Hence A is the answer.A is possible.

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B:the number of days with some rainfall, but no more than two inches, was the same in 1990 as in 1910

- As dissucssed in the arg,fewer days with light rainfall than in 1910 and fewer with moderate rainfallthe number of days with some rainfall, B would never happen since small plus small would never be the same or bigger

So B and C could never happen

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

-  D could never happen either since the amount of rains in moderate rainfall  has been defined .And meanwhile,the number of days of moderate rainfall has been said fewer that those in 1910.So it is impossible that total number of inches of rain that fell on days with moderate rainfall in 1990 was more.

E: the average amount of rainfall per month was lower in 1990 than in 1910

-  E could never happen since the total rainfall for 1990 was 20 percent higher in 1990 than in 1910. And as we all know that one year contains 365 days or 366 days .So the the average amount of rainfall per month must be higher in 1990 than in 1910

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So B/C/D/E could never happen and A is the anwer that is possible.

自我分析：

只能用排除法，B、C、D、E都绝对错，只剩A，但A的lower 应该是higher才是绝对正确。注意：题目问possible，那就有一种可能，大雨的天数也少，（但大雨每次的雨量超级大！BT题！我想是题目打字时写错了！）

原文：

In 1990, there were fewer days with light rainfall than in 1910 and fewer with moderate rainfall

意思是：小雨和中雨的天数，1990年的比1910年的少；但1990年降雨量是1910年的1.2倍。

B/C
   错误：原文已经说了，小雨和中雨的天数1990年比1910年少，所以不可能多于/ 等于1910年；

D：别看成one day；选项说：1990年中雨的降雨量是1910年的2倍。

原文是：1990年中雨的天数比1910年少，那降雨量比值如下；

因为中雨的标准是1—2 inch，

      年代  1990     1910

  中雨天数（例如）  10天     11天

中雨近最大值  1.99

中雨近最小值            1.01

因此：1990中雨最大雨量约是：19.9

         1910中雨最小雨量约是：10.1

两者相除的最大倍数，< 2 倍；所以 D 错。

（从此推断看，因为大雨的值域，只有最小值> 2即可，最大值可以无限大，因此：即使大雨的天数也少，但如果都每次都降远远大于2的暴雨，完全有可能提升年度总降雨量！）

E：
   原文已经给出1990年总降雨量是1910年的1.2倍，因此除以12个月，每个月平均降雨量1990年的仍旧是1910年的1.2倍，而不是低于1910年的。

A 是可以理解的，不是打错字了。即使1990的所有类型下雨的天数都少于1910,只要它的某天的降雨量暴大，就可以大于1910的降雨量.