推 cherrystyle: 謝謝D大指出我對官方解釋的誤解，咀嚼過後我理解更多 07/26 11:29
推 showind: 推 07/26 12:54
※ 引述《cherrystyle (聘可)》之銘言：
: OG13-107.
: Although the discount stores in Goreville’s central shopping district
: are expected to close within five years as a result of competition from
: a SpendLess discount department store that just opened, those locations
: will not stay vacant for long. In the five years since the opening of
: Colson's, a nondiscount department store, a new store has opened at the
: location of every store in the shopping district that closed because it
: could not compete with Colson’s.
: Which of the following, if true, most seriously weakens the argument?
: A. Many customers of Colson’s are expected to do less shopping there
: than they did before the SpendLess store opened.
: B. Increasingly, the stores that have opened in the central shopping
: district since Colson’s opened have been discount stores.
: C. At present, the central shopping district has as many stores
: operating in it as it ever had.
: D. Over the course of the next five years, it is expected that
: Goreville’s population will grow at a faster rate than it has for
: the past several decades.
: E. Many stores in the central shopping district sell types of
: merchandise that are not available at either SpendLess or Colson’s.
: 不太理解的地方是，
: 1.
: 官方解釋說在colson開幕後 那些無法競爭的店家關閉
: 隨後持續增加discount stores,
: 而spendless 開了後就不會再有discount store的需求，
: 請問要怎麼判斷出不會再有其他需求呢？
你指的應該是解釋裡的reasoning這一段吧：
「... that suggests that the stores were replaced because of a need that no
longer exists after the opening of SpendLess.」
但注意哦，官方解釋並沒有像你講的一樣，是說「不會再有discount store的需求」
是說「過去導致重開的需求，在spendless出現後不復存在」
在B選項下，這個需求其實指的是「不同類商店的需求」。
Colson是nondiscount store（想成精品百貨吧）
B：當初Colson開了之後，回來的商店都是discount store（想成五金生活百貨）
「有了精品百貨後，後來開的是五金百貨」
這個need指的是「人們需要不同種類的商店」而不是單指need of discount store。
（換個角度來想，如果今天題目寫的是colson是五金百貨，
而重開的都是精品百貨，你還會說need 叫做discount store嗎？
但概念是一樣的）
今天spendless本身就是五金百貨，商店是同類的，
那自然不會再有「不同類商店需求」。
你可能會問，那沒有discount 跟nondiscount之外的商店嗎？
抱歉，依照題目yes we have discount/ no we don't offer discount的二元分法下
沒有第三種分類
: 2.選項B
: 持續增加的discount store 表示可能不會再有店家被取代，
: 與題目現況比較
: 這些discount stores會在五年內預期關閉因為無法與Spendless競爭，
: 要怎麼weaken 倒閉之後的位置不太可能會有其他店家open呢？
呃，這裡你的表達有點誤解
應該是去削弱「倒閉之後的位置會有其他店家open」
理由在上面已經敘明。
: 這裡是否只要是能夠weaken 類比例子不成立即可
: 我根本無需將答案套入Spendless?
雖然說實戰做題之下，我們可以在讀出類比例子之後快速去找點出兩例差異點的選項
但是無論如何，檢討的時候還是要像現在這樣，把每一步都想清楚噢。
至於類比題的正確答案出題模式，OG已經寫得很清楚了：
Since the reasoning relies on a presumed similarity between the two cases,
any information that brings to light a relevant dissimilarity would weaken
the argument.
: 還請好心人解惑....謝謝><
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※ 編輯: danyuchn (220.136.52.20), 07/26/2015 01:57:54