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.
GWD-6-Q6:
Which of the following, if true, would most weaken Krech’s objections to Martin’s theory?
Further studies showing that the climatic change that occurred at the end of the Pleistocene era was even more severe and widespread than was previously believed
New discoveries indicating that Paleoindians made use of the small animals, plants, and insects that became extinct
Additional evidence indicating that widespread climatic change occurred not only at the end of the Pleistocene era but also in previous and subsequent eras
Researchers’ discoveries that many more species became extinct in North America at the end of the Pleistocene era than was previously believed
New discoveries establishing that both the arrival of humans in North America and the wave of Pleistocene extinctions took place much earlier than 11,000 years ago
答案是B。但是原文说的是 small animals, plants, andinsects disappeared, presumably not all through human consumption. ：那些灭绝的小动物并不全是被人类consume掉的。B说的是人类确实consume了那些灭绝的小动物。这个答案怎么能weaken呢？Krech并没有否认人类consume了动物呀。
当然别的答案也都不好，而且可能只有C还粘点边。 | 
