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标题: 求助个gwd [打印本页]

作者: cfr134 时间: 2009-8-22 23:24
标题: 求助个gwd
求助

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

这题答案怎么是a？谁能解释下。。

作者: bubumouse 时间: 2009-8-22 23:36

这题错了吧~~~没一个对的~~

作者: cfr134 时间: 2009-8-22 23:47
我觉得一定要选我会选d，因为虽然m的日子比以前少，但是m是1-2inch之间，如果10年都是1，90年都是2 d应该是可以对的，但是答案是a。。gwd的答案应该不太会错吧

作者: cfr134 时间: 2009-8-22 23:51
希望有大牛解答。。

作者: bubumouse 时间: 2009-8-23 00:04

我终于明白了

BCDE都不可能只有A是可能的因为heavy rain的降雨量没有上限

B 原文都说了l和M都少了，所以这个some rain 也应该少排除

C 和B一样

D 原文中M的天数少了，且降水量属于（1，2】所以总量不可能是1910年的两倍

E 每个月的降水量都比1910年每月少，总量更不可能多了

所以这个题只有A是有可能发生的

作者: cfr134 时间: 2009-8-23 01:25
bingo。。。我也明白了- -

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