发一贴，求一解～conclusion题

sicilia小山

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
   
   答案竟然是A，这说不通啊～
   1990年，小雨和中雨的天数都要比1910年少，但总雨量比1910年高出20%，为什么，暴雨的天数也要比1910年的少呢？～
   
   不懂不懂，求解释～感激不尽，好人好报啊～
   

dorothyyy

的确是A啊。
问题问的是 which is also possible。也就是说要选按照题干同样可以推出的选项。

先看BCDE：

B和C是同一类:the number of days with some rainfall, but no more than two inches, 这个描述指的是light+moderate两种。由于题干说了1990年这两种都比1910年少，所以BC都不对。
D:说1990的moderate雨量比1910多这同样是没道理的
E：1990年总量多，月平均是是不可能低于1910的。

再回过来看A，你的理解少了一个条件：heavy的天数少并不代表总雨量少。在A的条件下，1990年heavy的天数可以少（A条件成立），只要heavy的日子下的总雨量非常大，就能达到全年总雨量超过1910啦。

希望我的理解正确并且能帮到你~

布恩蒂亚

楼上说的不错，这题我也错了，没想到还有不下雨的天和降雨量非常大的天。把天数和雨量混淆了

justinlee17

二楼正解，补充一下D：

1990:light rainfall（0~1）和moderate rainfall(1~2)都少于1910，也就是x1<x2,y1<y2
moderate rainfall总量1990最多2y1，1910最少y2。由于y1<y2，所以做不到2y1 >2y2，也即D不成立。

兰心寒

唉，这题没想到点上之前就怎么想不明白。现在终于明白了

DeliciaAn

顶一下二楼。做了两遍，才发现自己才懂了。