20. Despite the approach of winter, oil prices to industrial customers are exceptionally low this year and likely to remain so. Therefore, unless the winter is especially severe, the price of natural gas to industrial customers is also likely to remain low.
Which of the following, if true, provides the most support for the conclusion above?
(A) Long-term weather forecasts predict a mild winter.
(B) The industrial users who consume most natural gas can quickly and cheaply switch to using oil instead.
(C) The largest sources of supply for both oil and natural gas are in subtropical regions unlikely to be affected by winter weather.
(D) The fuel requirements of industrial users of natural gas are not seriously affected by the weather.（B）
(E) Oil distribution is more likely to be affected by severe winter weather than is the distribution of natural gas.
看了这贴，我对这个问题也有了些感觉，我想补充一下我的想法：Therefore, unless the winter is especially severe, the price of natural gas to industrial customers is also likely to remain low. 就是说只有在winter is not especially severe的情况下，天然气的价格才会remain low。反之，winter is severe导致天然气价格上涨，但此时人们都改用了oil，用oil比用天然气更经济实惠（cheaply），而且还不费事（quickly）作者: CrapSociety 时间: 2013-1-8 06:46
I feel answer B is not very good, although there may not be a better answer.
If nature gas is expensive, industrial users will switch to oil. This is fine. However, this does not say nature gas price will remain low. It can still be expensive, but not many people using it.
Gold is expensive. So many people use silver to decorate. But gold is still expensive than silver.
This answer is not a typical ETS style. Just my opinion.作者: CrapSociety 时间: 2013-1-9 06:55
B does require the assumption that when demand decreases, the price will decrease accordingly. However, the question is asking for “the most support”. In another word, you should choose the best answer, not the perfect answer. This question epitomize the style of GMAT CR.
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