请求解答。。3x

1. in the united states, of the people who moved from one state or another when they retired, the percentage who retired to Florida has decreased by three percentage points over the past ten years. since many local business in Florida cater to retirees, this decline is likely to have a noticeably negative economic effect on these business.

which of the following, if true, most seriously weakens the arguement?

(D) the total number of people who retired and moved to another state for their retirement has increased significant over the past ten years

这个答案怎么解释？

in addition

  大牛们对boldface题有什么好的解题要领吗？

啊？米人帮偶啊？自己顶一下。。。。

因为退休后去移居FLORIDA的人的比例下降了，所以导致针对这些人的生意会不好。

但是如果退休的人比以前多很多，这样即使去FLORIDA的人的比例下降了，去的人也可能不比以前的人少。所以就反驳了论点。

BF没什么所谓的要领，一定要读懂题，通常里面会有两个对立的论点，要分析清楚哪句是conclusion，哪些是consideration or evidence用来支持conclusion的。多分析这种类型的题，你会发现其实一点都不难。