lsat 2 (2.2) questions

1stzhang · 发表于 2003-6-11 19:31:00

15. In a large residential building, there is a rule that no pets are allowed. A group of pet lovers tried to change that rule but failed. The rule-changing procedure outlined in the building’s regulations states that only if a group of tenants can obtain the signatures of 10 percent of the tenants on a petition to change a rule will the proposed change be put to a majority vote of all the tenants in the building. It follows that the pet lovers were voted down on their proposal by the majority of the tenants.

The argument depends on which one of the following assumptions?

(A) The pet lovers succeeded in obtaining the signatures of 10 percent of the tenants on their petition.

(B) The signatures of less than 10 percent of the tenants were obtained on the pet lovers’ petition.

(C) Ninety percent of the tenants are against changing the rule forbidding pets.

(D) The support of 10 percent of the tenants for a rule change ensures that the rule change will be adopted.

(E) The failure of the pet lovers to obtain the signatures of 10 percent of the tenants on their petition for a rule change ensures that the rule change will be voted down by a majority of the tenants.
it follows that the pet lovers were voted down on their proposal by the majority of the tenants. 是什么意思？我选B,答案选A.

22. All intelligent people are nearsighted. I am very nearsighted. So I must be a genius.

Which one of the following exhibits both of the logical flaws exhibited in the argument above?

(A) I must be stupid because all intelligent people are nearsighted and I have perfect eyesight.

(B) All chickens have beaks. This bird has a beak. So this bird must be a chicken.

(C) All pigs have four legs, but this spider has eight legs. So this spider must be twice as big as any pig.

(D) John is extremely happy, so he must be extremely tall because all tall people are happy.

(E) All geniuses are very nearsighted. I must be very nearsighted since I am a genius.

答案是D,我选B.我觉得B更好，请解释一下？

jacy · 发表于 2003-6-11 22:54:00

22。(B) All chickens have beaks. This bird has a beak. So this bird must be a chicken.
不好，因为This bird 不属于All chickens
原文中有2个推理，All intelligent people --》nearsighted
I-》people ，I-》nearsighted 所以错误的推出I must be a genius.

B少了一个假设所以与原题不符。

mindfree · 发表于 2003-6-11 23:01:00

1. As long as you understand the passage, you should fail on this one.

Obtaining signature of 10% of the tenants is a required condition for putting a proposal to a "referendum". So the process is:

1. Propose a change --> 2. obtain signature 10% --> 3. majority vote --> 4. pass or fail

Now we know that the proposed change failed and the conclusion is that it failed at the thrid link of majority vote. So the assumption here is the proposed change passed the first 2 links. So answer is A

2. There are two errors in the passage:
Intelligent people -->nearsighted ==> very nearsighted --> very intelligent
A-->B ==> very B--> very A

B does not show the second error, which is very B--> very A

D is right as its logic is tall --> happy ==> extremely happy --> extremely tall

1stzhang · 发表于 2003-6-12 12:22:00

以下是引用mindfree在2003-6-11 23:01:00的发言：
1. As long as you understand the passage, you should fail on this one.

Obtaining signature of 10% of the tenants is a required condition for putting a proposal to a "referendum". So the process is:

1. Propose a change --> 2. obtain signature 10% --> 3. majority vote --> 4. pass or fail

Now we know that the proposed change failed and the conclusion is that it failed at the thrid link of majority vote. So the assumption here is the proposed change passed the first 2 links. So answer is A

后办部分还是没有搞懂，请牛牛们再次指点

perfection · 发表于 2003-6-12 12:58:00

15) 作者说：超过10%signatures 就可以提交到 a majority vote of all the tenants 。
结论是 the pet lovers 已经 voted down on their proposal by the majority of the tenants.
显然 The pet lovers 已经成功获得 10%signatures ，如果没有获得 10%signatures ，怎么能到 majority of the tenants 上投票决定呢？

最好的办法是对A取非，而得到假设。

jacy · 发表于 2003-6-12 15:26:00

mindfree，
我能否再问个问题，关于22。
我这样想对不对，
原文认为：1。Intelligent people -->nearsighted
2。I nearsighted
有1，2推出 I--〉Intelligent people
又因为 I am people，所以推出 I--〉Intelligent
而b中只犯了第一个错误，即推出this bird--〉chicken，而没有后面的一步。
我的想法就是如果答案D改为：
John is extremely happy, so he must be extremely tall
because all tall GIRLS are happy。

那么D也是错的了。
请问，这样想对吗？

mindfree · 发表于 2003-6-13 02:03:00

1stzhang,

I suppose that Perfection has answered your question.

Jacy,

You add another logic link to thge problem. Yes, if D is change in the way you did, it would not be right.

jacy · 发表于 2003-6-13 16:10:00

thank mindfree for reply.

lsat 2 (2.2) questions

lsat 2 (2.2) questions

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