揽瓜阁 逻辑做题小分队Day163

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Spartina alterniflora, a grass native to salt marshes in eastern North America, was accidentally introduced into the continent's West Coast. Now S. alterniflora threatens to displace a closely related West Coast grass, Spartina foliosa. The invasion of an alien plant can sometimes be halted by introducing into the invaded area an insect that eats the invading species. Conservationists are considering this strategy as a way of combating further displacement of S. foliosa by S. alterniflora.

Determining which of the following would be most useful in assessing the strategy under consideration by the conservationists?

A. Whether any insects were accidentally introduced into the West Coast when S. alterniflora was accidentally introduced there

B. Whether S. alterniflora's displacement of S. foliosa is being hastened by insects that feed on S. foliosa but not on S. alterniflora

C. Whether S. alterniflora has ever been saved from the invasion of an alien species by the introduction of an insect

D. Whether there are insects that, if introduced into the invaded area, would eat only S. alterniflora

E. Whether, if the strategy under consideration were to halt the displacement of S, foliosa by S. alterniflora, S. foliosa would regain the territory it has already lost

Real estate agent: Over the past decade, our region’s population has increased over 10 percent, and so have inflation-adjusted sales prices of local homes. Demographers project that the population will rise even more rapidly over the coming decade. Population growth increases demand for homes, and home prices rise when demand rises relative to supply. Thus, housing prices over the next decade will probably also keep rising at least as rapidly as they have been.

Which of the following is an assumption the real estate agent’s argument requires?

A. Over the coming decade, the supply of homes in the region will not increase at a significantly greater rate than the demand for homes there.

B. Other things being equal, rising home prices tend to slow regional population growth.

C. Demographers have projected that the regional population growth will cause a proportional increase in inflation-adjusted sales prices of local homes.

D. Even if the regional population does not rise over the coming decade, local housing prices will probably continue to rise.

E. Rising priced for a product during one decade usually, if not always, indicate that prices for that product will continue to rise during the next decade.

参考答案：DA

alzn2765

典型的Logic Gap型CR题
这种题一般都符合以下形式：有A、B、C三个东西，前提讲了A和B的关系，结论是B和C会有某种关系。逻辑gap就是没说A和C的关系。
此题种：
Insect吃alterniflora-->alterniflora不抢foliosa的地儿
Gap: Insect和Foliosa缺了逻辑关系。即Insect吃不吃Foliosa?注意这里的Insect是特指，特指吃alterniflora的Insect。
解题技巧：找题目中有特指那种吃alterniflora的Insect 和 Foliosa的选项。
A. Any Insects，不是特指。那种Insect没出现。
B. 题中的Insect是吃alterniflora的Insect，该选项的主体是不吃alterniflora的Insect，无关。
C. An insect，不是特指。那种Insect没出现。
D. Insect吃啥，留着
E. 讨论的是foliosa，没Insect。

D选项中Insect是不是只吃alterniflora，等价于Insect不吃Foliosa，故为正确选项。

总结：错误选项只能有3种：
1. 没特指Insect （ABCE）
2. 没Foliosa
3. 以上2都没
正确选项为了提高难度，肯定不是直接给一个讨论同时有““insect”和“Foliosa”的选项。作为出题者，怎么变呢？就是加“非”呗！ABC选项就是把“非”加在了Insect上，导致讨论主体变为了“非”特指Insect，直接无关。而D选项中，并没有直接出现Foliosa，而是出现了alterniflora，其实就是作为“非”出现的：Insect只吃alterniflora，就是等于说“Insect“非”吃Foliosa。

这样，就想明白了出题者的所有套路，未来解题速度才能提升。

12121212133

1.D
D选项评价了用昆虫抵御外来植物入侵的负面作用，当负面作用过大时，方案不应该被采用。
2.A
A选项对应题干中，需求相比供给提高时，房价会提高，那么如果需求相比供给减少，就不符合题干中的条件。

Adamwarrior

感谢分享！               

断了的弦

da

vilanua

同意！               

lsk5641

Mark一下！               

红色绫波丽

dc

Yoyooooo1002

Yoyooooo1002

CA

第一题C是错的，原因是过往的、与其他植物相关的策略，与现在的、当前本地植物无关