GWD,一道突然想不明白的题目~

GWD1-Q13:

In the United States, of the people who moved from one state to another when they retired, the percentage who retired to Florida has decreased by three percentage points over the past ten years.  Since many local businesses in Florida cater to retirees, this decline is likely to have a noticeably negative economic effect on these businesses.

Which of the following, if true, most seriously weakens the argument?

A.      Florida attracts more people who move from one state to another when they retire than does any other state.

B.       The number of people who move out of Florida to accept employment in other states has increased over the past ten years.

C.      There are far more local businesses in Florida that cater to tourists than there are local businesses that cater to retirees.

D.      The total number of people who retired and moved to another state for their retirement has increased significantly over the past ten years.

E.       The number of people who left Florida when they retired to live in another state was greater last year than it was ten years ago.

原文是说总的退休人员中（从一地方到另一地方的）到Florida的下降了，但是因为Florida有很多适合退休人员的工作，所以这种情况会对经济有不好的影响。

答案是D项，有什么关系，总的（到别地方的）的退休人员变多了，没觉得weaken啊

求解~~

原文中：在全美50个州之间互相转移的所有的转移的人数里，转移到FL的人数所占百分比降了3

D：转移的人总人数增长了非常多

所以虽然到FL的人数占全体转移人数的比率降了，但是实际转移到FL的人数可能增长了很多

所以他的Business不一定经历negative impact

一个经历negative impact 的例子：

以前到FL有7人，全体人100人，是7%

现在全体总人数增多到10000， 到FL有400，占4%

该人净赚400-7=393！！！ 哇塞！好多的人啊！忙晕头了重病送医院，导致negative impact!!!

(*^__^*) 嘻嘻……，有个细节我没弄好，就是占比，是占总的比重下降，而我想得是FL本身和去年比比重下降了，这样看了，FL的经济是不一定受影响的，而且按照楼上第一算法，是积极的影响嘛

谢谢楼上好人嘿嘿