讨论下一题reasoning！！

lihaolan · 发表于 2012-8-30 21:47:31

Because dinosaurs were reptiles, scientists once assumed that, like all reptiles alive today, dinosaurs were cold-blooded. The recent discovery of dinosaur fossils in the northern arctic, however, has led a number of researchers to conclude that at least some dinosaurs might have been warm-blooded. These researchers point out that only warm-blooded animals could have withstood the frigid temperatures that are characteristic of arctic winters, whereas cold-blooded animals would have frozen to death in the extreme cold.
Which one of the following, if true, weakens the researchers’ argument?
(A) Today’s reptiles are generally confined to regions of temperate or even tropical climates.
(B) The fossils show the arctic dinosaurs to have been substantially smaller than other known species of dinosaurs.
(C) The arctic dinosaur fossils were found alongside fossils of plants known for their ability to withstand extremely cold temperatures.
(D) The number of fossils found together indicates herds of dinosaurs so large that they would need to migrate to find a continual food supply.
(E) Experts on prehistoric climatic conditions believe that winter temperatures in the prehistoric northern arctic were not significantly different from what they are today.

lihaolan · 发表于 2012-8-30 21:50:07

KEY D.这个削弱好难想。。。从D再到题目的conclusion似乎有点远。。。大家看看我解释是不是对的。因为恐龙要迁徙找食物，所以他不生活在北极。因此就削弱了C，这题大家看到题干要怎么思考！！

wslqj1127 · 发表于 2012-9-6 08:55:59

A. Irrelevant
B. Irrelevant
C. Strengthening
D. Weakening (Because D provided an alternative explanation to the discovery of dinos in cold environment... instead of saying the dinos "lived" in the area)
E. Irrelevant

stlibai · 发表于 2012-9-19 00:10:14

解释的好清晰!

s_dUSA · 发表于 2012-9-19 04:16:50

pay attention to "only".

Daken · 发表于 2012-12-9 11:22:53

D了因为题干是说无法忍受南极的winter 如果要迁徙的话就避开了winter 自然就击破了隐含的assumption 恐龙冬季在南极

PeytonS · 发表于 2012-12-10 23:01:24

我第一眼看到这题是这么想的：因为温血恐龙在北极全死了，说明他们可能是因为承受不了寒冷，所以他们很可能就不是在这生活的，还是搬过来的因为不适应所以死了。

但是我觉得更合适的思路是，科学家认为恐龙可能是温血是因为他们在北极发现了恐龙化石，在此科学家假定恐龙是生活在北极的，所以他们必须适应北极寒冷的气候否则就会死，所以他们是温血的，除此之外没有说到其他证据。所以最好的反驳是恐龙其实不是“生活”在北极

讨论下一题reasoning！！

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