GWD-11-Q41 这题结论到底指什么

dreamroad

?GWD-11-Q41:
?Charcoal from a hearth site in Colorado, 2,000 miles south of Alaska, is known to be 11,200 years old.  Researchers reasoned that, since glaciers prevented human migration south from the Alaska-Siberia land bridge between 18,000 and 11,000 years ago, humans must have come to the Americas more than 18,000 years ago.
?Which of the following pieces of new evidence would cast doubt on the conclusion drawn above?
A.Using new radiocarbon dating techniques, it was determined that the charcoal from the Colorado site was at least 11,400 years old. B.Another campsite was found in New Mexico with remains dated at 16,000 years old. C.A computer simulation of glacial activity showed that it would already have been impossible for humans to travel south overland from Alaska 18,500 years ago. D.Using new radiocarbon dating techniques, it was proved that an ice-free corridor allowed passage south from the Alaska-Siberia land bridge at least 11,400 years ago. E.Studies of various other hunting-gathering populations showed convincingly that, once the glaciers allowed passage, humans could have migrated from Alaska to Colorado in about 20 years.
看到有不同的说法，有的说第一句是结论，但大部分人说最后是结论，请问到底哪个是结论呢

dreamroad

不好意思，上面那个太乱了，重新发下

GWD-11-Q41

Charcoal from a hearth site in Colorado, 2,000 miles south of Alaska, is known to be 11,200 years old.  Researchers reasoned that, since glaciers prevented human migration south from the Alaska-Siberia land bridge between 18,000 and 11,000 years ago, humans must have come to the Americas more than 18,000 years ago.

Which of the following pieces of new evidence would cast doubt on the conclusion drawn above?

A.Using new radiocarbon dating techniques, it was determined that the charcoal from the Colorado site was at least 11,400 years old.
B.Another campsite was found in New Mexico with remains dated at 16,000 years old.
C.A computer simulation of glacial activity showed that it would already have been impossible for humans to travel south overland from Alaska 18,500 years ago.
D.Using new radiocarbon dating techniques, it was proved that an ice-free corridor allowed passage south from the Alaska-Siberia land bridge at least 11,400 years ago.
E.Studies of various other hunting-gathering populations showed convincingly that, once the glaciers allowed passage, humans could have migrated from Alaska to Colorado in about 20 years.

netbanker

答案是C？

dreamroad

答案是D哦

kathy1989717

evidence1：Charcoal from a hearth site in Colorado, 2,000 miles south of Alaska, is known to be 11,200 years old.
evidence2：glaciers prevented human migration south from the Alaska-Siberia land bridge between 18,000 and 11,000 years ago
conclusion： humans must have come to the Americas more than 18,000 years ago

-------------------------------------------------翻译中文----------------------------------------------------
1.木炭（发现的遗址地--colorado）有11200年历史了
2.冰川阻止人们南迁在18000-11000年以前

结论：故，人类肯定是在18000年以前到达美国的。

问weaken。

mdautobox

B 说another  是无关选项
E 说  in 20years 也是五官选项
A 中强调是charcoal  不是结论部分
总上CD是相关选项
C说18000之前就不能通过了~~
D说在18000和11000之间可以通过~~~
所以D更好的反驳的结论~~C直接把人类通过的可能性都给弄没了

lala974

up up

viridian

EVIDENCE1 在阿拉斯加南部发现人类使用过的炭 有11200年历史
EVIDENCE2 从西伯利亚通往阿拉斯加的大陆桥从 18000年到11000年是不能用的

CONCLUSION 人类在18000年以前就已经去到了阿拉斯加

A选项说 炭其实应该有11400年历史 对结论没有影响
B选项 说的是一个无关事项。。
C选项 补充EVIDENCE2说其实18500年前就不能用了  对结论没有重大影响
D选项 发现一个通道使得人类至少可以在11400年以前 从西伯利亚到阿拉斯加 推翻了结论18000年以前的论断 应该为正确选项
E选项 无关事项

icever

nice
EVIDENCE1 在阿拉斯加南部发现人类使用过的炭 有11200年历史
EVIDENCE2 从西伯利亚通往阿拉斯加的大陆桥从 18000年到11000年是不能用的

CONCLUSION 人类在18000年以前就已经去到了阿拉斯加

A选项说 炭其实应该有11400年历史 对结论没有影响
B选项 说的是一个无关事项。。
C选项 补充EVIDENCE2说其实18500年前就不能用了  对结论没有重大影响
D选项 发现一个通道使得人类至少可以在11400年以前 从西伯利亚到阿拉斯加 推翻了结论18000年以前的论断 应该为正确选项
E选项 无关事项

-- by 会员 viridian (2011/6/29 16:42:32)

niclively

mdautobox 发表于 2011-6-9 18:46
B 说another  是无关选项E 说  in 20years 也是五官选项A 中强调是charcoal  不是结论部分 ...

goooooood!!!!!!!!!!!!!!!!