25-2-19,22,24

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.（A）

(E) The mass extinction would have occurred soon after the impact that supposedly caused it.

The biologist’s view, if true, provides the most support for which one of the following?

(A) The evolutionary pressure to ensure a diverse gene pool could have the effect of increasing the frequency of a gene for small size.

(B) The unusual frequency of small goats in island populations is not a result of the greater reproductive success small goats possess when space is limited.

(C) Contrary to what some believe, large goats achieve greater reproductive success than small goats even when space is limited.

(D) The evolutionary pressure to ensure diverse gene pool does not have the effect of increasing the frequency of a gene for small size.（D）

(E) A diverse gene pool cannot be achieved in a goat population unless the average size of its members is reduced.

這兩題  我看半天 就是看不懂  可不可以請了久的人翻譯一下  

24.   Mr. Nance: Ms. Chan said that she retired from Quad Cities Corporation, and had received a watch and a wonderful party as thanks for her 40 years of loyal service. But I overheard a colleague of hers say that Ms. Chan will be gone for much of the next year on business trips and is now working harder than she ever did before; that does not sound like retirement to me. At least one of them is not telling the truth.

M. Nance’s reasoning is flawed because it

(A) is based in part on hearsay

(B) criticizes Ms. Chan rather than the claims she made

(C) draws a conclusion based on equivocal language

(D) fails to consider that Ms. Chan’s colleague may have been deceived by her（C）

(E) fails to infer that Ms. Chan must be a person of superior character, given her long loyal service

還有這一題  我選D  想問為什麼  D不對???  謝謝