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标题: 求一道逻辑题！！！！！ [打印本页]

作者: ycenyidol 时间: 2012-3-9 19:55
标题: 求一道逻辑题！！！！！
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 lowerin 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

作者: sunny20111126 时间: 2012-3-9 23:33
选啥呀？A对吗

作者: zywppsh 时间: 2012-3-10 13:03
应该是A吧。。
B,C选项的Paraphrase一下的意思就是the number of days with light and moderate rainfall，题干中已经提到两者数量都小于1910年，所以相加也必定小于1910年。
D选项 moderate rainfall的范围是（1,2] ，因此要使1990年的数量是1910年的两倍，至少他们下雨的日子数量应相等。由于题干中提到，1990年下雨数量比1910年少，所以此选项不可能，排除。
E选项是平均数的概念，因此用降雨量除以12个月。90年的总降雨量高于91年，所以平均数也大于91年。

作者: ycenyidol 时间: 2012-3-10 13:11
是A，我不懂得是，light rain和moderate rain的天数都少，然后总的降雨量要大，那岂不是heavy rain 的天数要大么，为什么是lowe呢？

作者: zywppsh 时间: 2012-3-10 13:16

是A，我不懂得是，light rain和moderate rain的天数都少，然后总的降雨量要大，那岂不是heavy rain 的天数要大么，为什么是lowe呢？

-- by 会员 ycenyidol (2012/3/10 13:11:43)

heavy rainfall规定了降雨量的范围>2，固然1990Heavy rainfall降雨天数少，但是它每天降雨多，因此总降雨量大

作者: rachel910903 时间: 2012-3-11 00:19
heavy rain的total rainful肯定是1990多
但total rainfall=heavy rain days * rainfall per heavy rain day
由于rainfall per heavy rain day没有上限，题中也只是问了possible，因此more 或 less都是有可能的

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