求问一道题

取巧

GWD6-Q5 to Q7:
     According to a theory advanced byresearcher Paul Martin, the wave of species extinctions that occurred in North America about 11,000 years ago, at the end of thePleistocene era, can be directly attributed to the arrival of humans, i.e., thePaleoindians, who were ancestors of modern Native Americans.  However, anthropologist Shepard Krech pointsout that large animal species vanished even in areas where there is no evidenceto demonstrate that Paleoindians hunted them. Nor were extinctions confined tolarge animals:  small animals, plants,and insects disappeared, presumably not all through human consumption.  Krech also contradicts Martin’s exclusion of climaticchange as an explanation by asserting that widespread climatic change didindeed occur at the end of the Pleistocene. Still, Krech attributes secondary if not primary responsibility for theextinctions to the Paleoindians, arguing that humans have produced localextinctions elsewhere. But, according tohistorian Richard White, even the attribution of secondary responsibility maynot be supported by the evidence.  Whiteobserves that Martin’s thesis depends on coinciding dates for the arrival ofhumans and the decline of large animal species, and Krech, though aware thatthe dates are controversial, does not challenge them; yet recent archaeologicaldiscoveries are providing evidence that the date of human arrival was muchearlier than 11,000 years ago.




Q5:
Which of the following istrue about Martin’s theory, as that theory is described in the passage?

A.     It assumes that the Paleoindians were primarily dependenton hunting for survival.
B.      It denies that the Pleistocene species extinctions werecaused by climate change.
C.     It uses as evidence the fact that humans have producedlocal extinctions in other situations.
D.     It attempts to address the controversy over the date ofhuman arrival in North America.
E.      It admits the possibility that factors other than thearrival of humans played a role in the Pleistocene extinctions.
答案是B我选C了
B   climate change出现在Martin’s theory的后面，是S K 提出的。所以我直接排除了
    想想看，为什么Martin’s theory能否定出现在后面地S K的观点呢？
C   也不对，文章我划了线的部分也不能推出C