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GMAT逻辑 In the United States,of the people who moved from one

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GMAT逻辑
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.
我选了C.我觉得C说当地的公司很多是提供给tourists的,所以retiree减少也不会影响他们的经济效益.D我就搞不明白了
GMAT逻辑 In the United States,of the people who moved from one
D.The total number of people who retired and moved to another state for their retirement has increased significantly over the past ten years.
D的理由是 总退休及移居到别州的人口增幅惊人 即使移居到Florida的百分比下降 但是实际上移居的人可能是变多了(number*%) 这是一个数学题
100*20%