gwd6-5

suikyfly

  According to a theory advanced

            by researcher Paul Martin, the wave

            of species extinctions that occurred

Line     in North America about 11,000 years

  (5)      ago, at the end of the Pleistocene era,

can be directly attributed to the arrival

of humans, i.e., the Paleoindians, who

were ancestors of modern Native

Americans.  However, anthropologist

(10)     Shepard Krech points out that large

animal species vanished even in areas

where there is no evidence to demon-

strate that Paleoindians hunted them.

Nor were extinctions confined to large

(15)     animals:  small animals, plants, and

insects disappeared, presumably not

all through human consumption.  Krech

also contradicts Martin’s exclusion of

climatic change as an explanation by

(20)     asserting that widespread climatic

            change did indeed occur at the end of

            the Pleistocene.  Still, Krech attributes

secondary if not primary responsibility

for the extinctions to the Paleoindians,

(25)     arguing that humans have produced

local extinctions elsewhere.  But,

according to historian Richard White,

even the attribution of secondary

responsibility may not be supported

(30)     by the evidence.  White observes that

Martin’s thesis depends on coinciding

dates for the arrival of humans and the

            decline of large animal species, and

Krech, though aware that the dates

(35)     are controversial, does not challenge

them; yet recent archaeological

discoveries are providing evidence

that the date of human arrival was

much earlier than 11,000 years ago.

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

                        

It assumes that the Paleoindians were primarily dependent on hunting for survival.

It denies that the Pleistocene species extinctions were caused by climate change.

It uses as evidence the fact that humans have produced local extinctions in other situations.

It attempts to address the controversy over the date of human arrival in North America.

It admits the possibility that factors other than the arrival of humans played a role in the Pleistocene extinctions.

Can anyone help explain this question? I still think the answer should be A  rather than B. Thanks.

而今迈步从头越

Pls refer to the highlighted parts:

According to a theory advanced

            by researcher Paul Martin, the wave

            of species extinctions that occurred

Line     in LACE w:st="on">North AmericaLACE> about 11,000 years

  (5)      ago, at the end of the Pleistocene era,

can be directly attributed to the arrival

of humans,

Krech also contradicts Martin’s exclusion of

climatic change as an explanation by

(20)     asserting that widespread climatic

            change did indeed occur at the end of

            the Pleistocene.

suikyfly

Thanks!!

smilingalone

那A为什么不对呢

russellguo

是啊 ，我也觉得However, anthropologist Shepard Krech points out that large animal species vanished even in areas where there is no evidence to demonstrate that Paleoindians hunted them.这句话取非，不也可以么，那A就对啦

michellejoy

文章没提Paleoindians靠什么生活