The cost of flood damage since 1980 has been
greater in areas that have adopted flood-control
measures than in those that have not. Thus, flood-
control projects are expensive engineering mistakes
and a substantial waste of resources.
Which of the following, if true, would be most
damaging to the argument above?
A) Those areas that had not suffered flood damage
before 1980 are the only ones that have not
adopted flood-control measures.
黃冠文說: 前提 1980 → some 有防洪 cost(damage) high
others 沒防洪 cost(damage) low
論 防洪 mistakes and waste of resources
Weaken : *錯誤比較
有效沒效跟自己比
A) 有防洪 cost 100 ↓ 50
沒防洪 cost 0 ↓ 0 (50 > 0)
沒防洪的從來沒有洪水, cost必然比裝了防洪措施
但減少很多洪水損失的地方 "低的多"
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