揽瓜阁逻辑做题小分队 第42天

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1.Every fall Croton's jays migrate south. The jays always join flocks of migrating crookbeaks with which they share the same summer and winter territories. If a jay becomes separated from the crookbeaks it is accompanying, it wanders until it comes across another flock of crookbeaks. Clearly, therefore, Croton's jays lack the navigational ability to find their way south on their own.

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

A. Migrating flocks of crookbeaks display no aggression when Croton's jays attempt to join them.

B. The three species most closely related to Croton's jays do not migrate at all.

C. Species other than Croton s jays occasionally accompany flocks of migrating crookbeaks.

D. Croton’s jays lay their eggs in the nests of crookbeaks, which breed and build their nests upon reaching their southern destinations.

E. Migrating crookbeaks derive some protection from hawks because of the presence of the larger and more aggressive Croton's jays in their flocks.

2.Motor vehicles can be powered by many technically feasible alternatives to the traditional petroleum-based fuels produced by the established oil producers. However, these alternatives are at present somewhat too expensive to compete effectively with those traditional fuels. It follows that established oil producers whose goal is to continue to maximize their share of the total global energy market entirely through sales of traditional petroleum products should______

Which of the following most logically completes the argument above?

A. invest a larger proportion of their profits to enhance the efficiency of alternative energy sources

B. convince automakers to manufacture smaller, less expensive new cars that will be affordable for more people

C. exercise caution when they raise prices in response to increased demand for their products

D. seek arrangements with other oil producers to prevent excess inventories of oil by-products

E. direct their marketing efforts toward those countries in which the alternative means of powering motor vehicles are least popular

参考答案：

DC

lfengi

Weaken：E - Jay 跟着Crookbeak的原因时因为需要下蛋在crookbeak的南方的巢穴里， 而不是因为自己找不到路。
C

大月亮cyn

Day42
1. [Weaken] D
【P】 C's jays -> south; a jay, if separated, wanders until it comes across another flock of crookbeaks.
【C】 C's jays lack the navigational ability to find their way south
D Croton’s jays lay their eggs in the nests of crookbeaks breakdown causality √
2. [Conclusion]
【P】车能源alternatives比传统贵很多，想要继续通过traditional products来最大化市场的 需要：？
C. exercise caution when they raise prices √ cheap 是traditional的优势所以要提价格的时候就要小心
E. 干扰项 toward those countries 看起来合理，但目的范围total global energy market        

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