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B. Twenty-five percent of the debt the government has accumulated in stockpiling helium is not an insignificant portion of the government’s total debt.

C. It is not in the lawmaker’s interest to advocate raising taxes as a means of reducing government debt.

D. Attempts to sell the government’s helium will not depress the market price of helium by more than 25 percent.

E. The government will not incur any costs in closing its facilities for stockpiling helium.

passage does not mention anything about :closing its facilities for stockpiling helium

以下是引用lymmba在2005-12-13 16:31:00的发言：

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?
A.    The government has no current need for helium.
B.    Twenty-five percent of the debt the government has accumulated in stockpiling helium is not an insignificant portion of the government’s total debt.
C.    It is not in the lawmaker’s interest to advocate raising taxes as a means of reducing government debt.
D.    Attempts to sell the government’s helium will not depress the market price of helium by more than 25 percent.
E.    The government will not incur any costs in closing its facilities for stockpiling helium.
我感觉到D 和 E都可以。E似乎好些，请诸位大侠发表高见。

这道题可以这样来做。
把D加个not，也就是说，政府卖掉Helium的话，会打压Helium市场价格超过25％，也就是卖不到好价钱了，政府的收入就少了很多，那么也就不还清债了。－－》对原结论削弱。所以选D。
把E加个not看看，如果政府关闭存储Helium的设备的话，还要引起一些花费，比如花费2毛钱。那么政府要从卖Helium的总收入中来扣除这笔额外的2毛钱花费。结果，对政府的总收入几乎没有什么影响，只是个零头，可以忽略不计。－－》对原结论没有削弱。所以E错。

以下是引用kimbol在2006-3-8 13:25:00的发言：

D is better .

passage does not mention anything about :closing its facilities for stockpiling helium

Twenty-five percent of the debt is the extra amount of money the government will save after taking care of the helium itself. If this amount is comparable to the total governmental debt, then the sale will make sure that the government can not only pay off that debt but reduce its overall debt as well.

depressing of the market price is among one of the many conditions that can affect the outcome of the sale, but is not an assumption that the argument relies on. Even if the market price of the helium will not go down by 25%, who knows how much it is worth. Maybe it is $1 million, while the remaining governmental debt is $1 billion. Hence, another assumption has to be added here: that value of the 25% percent should be about the same as the remaining governmental debt.

以下是引用gonghao在2006-9-7 15:23:00的发言：

选D

对B取非not insignificant－－－》insignificant，支持结论

D，如果下降超过25％，那连reduce debt也没了

对B取非not insignificant－－－》insignificant，then it is impossible to pay off the rest of the government debt by using this extra 25% value. hence, it doesn't 支持结论

it is impossible to pay off the rest of the government debt by using this extra 25% value

结论是the government can not only pay off that debt but reduce its overall debt as well

For some reason I misread the conclusion as: the government can not only pay off that debt but also erase its overall debt as well.

个人观点：A为无关选项。ETS在众多的选项中设置有类似的迷惑选项。做多了，一眼就能看出是无关选项。因为政府需不需要不在原文推理链中。

再者，可用取非验证。取非后，政府需要这个设施。这个结论对原文推理无影响。之所以有人认为这个结论对原文结论有影响，是因为在这个结论的基础上，再加上的附加的前提。如，因为政府需要，就不能卖了，就达到文中所说的结论了。这是你自己加上去的附加前提。这样的推理个人认为，在ETS看来，叫哲学，不是逻辑。不过，咱们中国人容易犯这种错误，原因就在于咱们发散思维比较多，哲学头脑比较多啊。

我觉得A可以用楼上一位NN支持D排除E的类似办法排除。我先贴在下面. 那么对A来说，即使政府需要买helium，也和需要的程度有关系。需要多少是一个问题，和E一样，关掉工厂需要附加其他多少成本，这些都可能是很insignificant的影响。而D就不一样，因为它的程度是很significant的（会打压超过25%的市场，意味着所得的都没了），很影响决定。所以D对，AE错。这也说明了做assumption题是，选项必须是可以达到影响原文推论程度的必要条件，有一些迷惑选项也类似设置成必要条件，但是必要的程度可能不够，不足以影响结论，所以错。

把D加个not，也就是说，政府卖掉Helium的话，会打压Helium市场价格超过25％，也就是卖不到好价钱了，政府的收入就少了很多，那么也就不还清债了。－－》对原结论削弱。所以选D。
把E加个not看看，如果政府关闭存储Helium的设备的话，还要引起一些花费，比如花费2毛钱。那么政府要从卖Helium的总收入中来扣除这笔额外的2毛钱花费。结果，对政府的总收入几乎没有什么影响，只是个零头，可以忽略不计。－－》对原结论没有削弱。所以E错。