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题库 / GMATLA-CR-90
Lawmaker: Raising taxes is not the only means of reducing government debt. The government's stockpile of helium is worth 25 percent more, at current market prices, than the debt accumulated in acquiring and storing it. Therefore, by selling the helium, the government can not only pay off that debt but reduce its overall debt as well.
Which of the following is an assumption on which the argument depends?
The government has no current need for helium.
Twenty-five percent of the debt the government has accumulated in stockpiling helium is not an insignificant portion of the government's total debt.
It is not in the lawmaker's interest to advocate raising taxes as a means of reducing government debt.
Attempts to sell the government's helium will not depress the market price of helium by more than 25 percent.
The government will not incur any costs in closing its facilities for stockpiling helium.
直接支持结论，结论是在卖掉的前提下，政府能还债，所以A不对，不能怀疑卖掉这个前提，而应该关注能不能还债。
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a, 问方案的前提，即一定要卖了
d, 如果市价跌幅超过25%，政府能获得的钱少，不一定能还债务
背景：政府要降低债务。依据政府现在的氦的储量，如果要出售的话，依据现在的市价，政府可以赚25%（相对之前买和储存产生的债务）
目的：政府偿还买H的债务，同时偿还其他的债
方案：把H卖掉
A：政府现在没有使用H的需求。和卖掉H和这个方案能否偿还债务无关，没有对逻辑链进行加强或削弱。
B：政府现在的总债blabla 无关
C：L的interest 无关
D：把政府手里的H都卖掉了，不会造成H的市价下跌超过25%。如果会下跌，这个方案就没有可行性，如果不会下跌，这个方案就可以达成目的。正确
E：储存H的设备的cost 无关
now: the value of H is more than 25% of debt, it covers all debt still leaves 25%
if the selloff causes price plunge: the value of H down 25%, value of H becomes 125%*75%=375/400<100% of debt, can not cover all debt
因为H的价值是有富余的，所以就算A选项政府需要用H，想还债也能还，D最直接
直接支持结论，结论是在卖掉的前提下，政府能还债，所以A不对，不能怀疑卖掉这个前提，而应该关注能不能还债。
错选B：不需要考虑政府的总债务，仅需考虑the debt accumulated in acquiring and storing it.
E错的原因：不需要考虑closing之后的成本，因为题干问的是by selling the helium.
找“就算卖了也可能还不了债”的选项
前提是卖掉，所以要假设前提成立，会卖掉
我开始也选A， 觉得要是需要的话不就不能卖了，但仔细看了下题目，其实问的是argument的assumption， argument是给了前提的：通过卖h，重点是by selling the helium之后的部分，所以和A选项就有点抬杠了，因为已经确定要卖了。
D不是在反驳前提——反驳前提的选项非常少