lsat25-4-16

christyding

16. The familiar slogan "survival of the fittest" is popularly used to express the claim, often mistakenly attributed to evolutionary biologists, that the fittest are most likely to survive. However, biologists use the term "fittest " to mean "most likely to survive are the most likely to survive. While this claim is clearly true, it is a tautology and so is neither informative nor of scientific interest.

The argument above depends on assuming which one of the following? (A) All claims that are of scientific interest are informative.

(B) Only claims that are true are of scientific interest.

(C) Popular slogans are seldom informative or of scientific interest.

(D) Informative scientific claims cannot use terms in the way they are popularly used.

(E) The truth of a purported scientific claim is not sufficient for it to be of scientific interest.

看不明白题目中最后一句与前文的逻辑关系，只是用排除法得到答案e

，请问题目的逻辑关系和答案如何成为假设

christyding

19. Professor Robinson: A large meteorite impact crater in a certain region was thought to be the clue to explaining the mass extinction of plant and animal species that occurred at the end of the Mesozoic era. However, the crystalline structure of rocks recovered at the site indicates that the impact that formed this crater was not the culprit. When molten rocks crystallize, they display the polarity of Earth’s magnetic field at that time. But the recrystallized rocks recovered at the site display normal magnetic polarity, even though Earth’s magnetic field was reversed at the time of the mass extinction.

Each of the following is an assumption on which Professor Robinson’s argument depends EXCEPT:

(A) The crater indicates an impact of more than sufficient size to have caused the mass extinction.

(B) The recovered rocks recrystallized shortly after they melted.

(C) No other event caused the rocks to melt after the impact formed the crater.

(D) The recovered rocks melted as a result of the impact that formed the crater.

(E) The mass extinction would have occurred soon after the impact that supposedly caused it. 还有这一题，完全搞不清楚crystalline structure  magnetic field 与cater有什么关系