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.

看了参考答案，竟然说是D，怎么可能呢？

大家说应该是选什么啊？

D没问题, 想问一下E为什么错.

原文结论是来Florida的退休人员占退休以后移居人的比例下降会导致经济不好.

E: Florida州自己的退休人员减少而导致经济不好, 有点像他因削弱. 为何不对?

a不对呀。文中是Florida的过去和现在的比较，比较的基础是一个州的不同时间。

拿Florida 和别的州比较在这里是没有意义的，范畴上的不一致。