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romi0813 · 发表于 2010-11-12 06:35:42

文章如下~~~
According to a theory advanced
by researcher Paul Martin, the wave
of species extinctions that occurred
in North America about 11,000 years
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
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
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
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,
arguing that humans have produced
local extinctions elsewhere. But,
according to historian Richard White,
even the attribution of secondary
responsibility may not be supported
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
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.

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

A.   It assumes that the Paleoindians were primarily dependent on hunting for survival.
B.   It denies that the Pleistocene species extinctions were caused by climate change.
C.   It uses as evidence the fact that humans have produced local extinctions in other situations.
D.   It attempts to address the controversy over the date of human arrival in North America.
E.   It admits the possibility that factors other than the arrival of humans played a role in the Pleistocene extinctions.

答案是B
為什麼是B呀????有人可以幫我解釋一下???
感謝!!!!!!!!!!!!!

romi0813 · 发表于 2010-11-12 06:43:28

........................sorry我想我figure it out了....沒看清楚題目呀!!!!!!

sdcar2010 · 发表于 2010-11-12 07:04:32

Krech also contradicts Martin’s exclusion of climatic change as an explanation by asserting that widespread climatic change did indeed occur at the end of the Pleistocene .

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