标题: 一道没想通的题求指点 [打印本页] 作者: 穆汐寒 时间: 2017-3-10 19:25 标题: 一道没想通的题求指点 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
这题没想通，1990年light rainfall和moderate rainfall 的天数都比1910年少，但总雨量比1910年高20%，那要是heavy rainfall也少了，多出来的20%是怎么做到的？ 作者: lisiberry 时间: 2017-3-10 21:01
看了一眼，不会，晚上再来看看。作者: RRZZR 时间: 2017-3-11 00:38
每天下雨的量 和 下雨的天数是不一样 的。
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