GWD-26-Q10

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.

答案给的是D,我觉得应该是A

如果是D，应该把25percent改成20percent

有两个方向的想法。首先A去非。美国政府有hel的需要，这并不意味着美国就不能卖hel，题目的主线是卖hel 可不可以还债。即使美国政府需要hel,他还可以去卖hel还债。 除非说All of the hel available is to be needed by US industry.这样hel就不能卖了。

C得说法是卖了25%得不会导致价钱降低。取非以后以后就是说卖了25%会导致hel无利可图。题目的主线是卖hel有利可图，所以卖hel还债。 C非，就是断桥削弱。

个人意见，仅供参考

谢谢楼上先～

不过 by selling the helium, the government can not only pay off that debt but reduce its overall debt as well.这里是说，卖了它可以还买他欠的债，还可以减少总债务（其实这里一样的，减了买它欠的债，就减了总债务）因为问的是assumption，必要条件，其实必要条件取非结论不成立，也可以逆否一下，即从原结论可以推出必要条件

卖h能还买它的债，最多降价百分之20，百分之25时，就还不起买h欠下的债啦呀～

继续讨论～

当出买它花了X元，现在的价值是1.25X，按现在的水平，1.25X*(1-0.2)=X，如果降百分之25，就会小于X，还不起债啦～～

赞同XIAOWAN的意见，对于20％的临界值

不过对于A的取非，个人感觉不是题目的讨论范围。

他们讨论的是：卖掉H，能不能抵债

没有必要去说不买H会怎么样

xiaowan的算法有道理。一看就是做accounting的 :-)

我觉得这里面有一个中间假设，也就是第二次的价格参照点是增加了25%以后的卖价。也就是涉及了第二个跳跃。D中说的是 the market price， 咱用语法的思想就是前文提到的market price,也就是说是那个进货价。我记得我上过的finance课里面，base cost如果前文提到，后面都会说the cost.如果要提出compunded cost的话，都会重新明确指出。估计楼主高估美国人脑筋拉。我这么编大家觉得合适么？

我知道斑斑是在说充分必要的问题，可是这里不是，这里只是描速一种情况，by selling可以怎样，并不是if....可以看下这题

1.        GWD-17-Q34

During the month of May, crabs arrive on Delaware’s beaches to lay eggs.  Certain shorebirds depend on these eggs for food during their annual spring migration to their northern breeding grounds.  Delaware’s crab population has declined recently.  This decline, however, poses no serious threat to the migrating shorebird populations:  by remaining longer in Delaware, the birds will be able to eat enough crab eggs to allow them to complete their migration.

Which of the following, if true, most seriously weakens the argument?

1. No other food available to the birds on Delaware’s beaches is as nutritious and accessible as are crab eggs.

2. The decline in the number of crabs on Delaware’s beaches is due to the harvesting of crabs by humans.

3. There are more crabs on Delaware’s beaches than in any other area that the migrating birds pass through.

4. The crabs do not conceal their eggs.

5. The earlier in the season the shorebirds complete their migration, the more likely they are to breed successfully.

这里by remaining longer....答案就是说的它能remaining longer

重新看gwd26-10 by sellling 政府需要和selling不是矛盾的么？

D的意思是卖H，不会使市场价压低百分之25，只能是从现在压低，从以前的价格怎么压低呀，我知道，也许大家都认为D想表达的就是它的价格没有降回原来的水平，一方面这里压价只能从现在压，另一方面就算它降回原来水平卖了，还是可以还原来买它欠的债；这样就更说明是不能卖了！

继续讨论～～

谢谢楼上两位GG先