lsat-1-4-21

icyeye

21. A low-pressure weather system is approaching Plainville; rainfall results from about 70 percent of such systems in the Plainville area. Moreover, the current season, spring, is the time of year in which thundershowers, which sometimes result from low-pressure systems, are most likely to occur in Plainville.

Knowing which one of the following, in addition to the information above, would be most useful for determining the probability that Plainville will have a thundershower soon?

(B) the percentage of spring rainfalls in Plainville that are thundershowers

(C) the percentage of thundershowers in Plainville that result from low-pressure systems(这个选项不是单独就可以推倒出来了吗？)

lawyer_1

回答过，请搜索。另外，请楼主贴全选项。

icyeye

我知道回答过，但是说得不清楚。而且我想问的是c为什么不对?

flyingceleste

“spring, is the time of year in which thundershowers, which sometimes result from low-pressure systems, are most likely to occur in Plainville”

春天是最易有飓风在P发生得季节，这些飓风有时是由低压造成得，如何能得出低压造成飓风在P发生得概率？

icyeye

哦，我知道了，是因为thundershowers是“有时候”（which sometimes result from。。。），所以仅仅用d说明春天全部的thundershower是不完整的，这样子理解是不是正确？