题目是这样的：
Networks of blood vessels in bats’ wings serve only to disperse heat
generated in flight. This heat is generated only because bats flap their wings.
Thus paleontologists’ recent discovery that the winged dinosaur Sandactylus had
similar networks of blood vessels in the skin of its wings provides evidence
for the hypothesis that Sandactylus flew by flapping its wings, not just by
gliding.
89. The
argument in the passage relies on which of the following assumptions?
(A) Sandactylus would not have had
networks of blood vessels in the skin of its wings if these networks were of no
use to Sandactylus.
(B) All creatures that fly by flapping
their wings have networks of blood vessels in the skin of their wings.
(C) Winged dinosaurs that flapped their
wings in flight would have been able to fly more effectively than winged
dinosaurs that could only glide.
(D) If Sandactylus flew by flapping its
wings, then paleontologists would certainly be able to find some evidence that
it did so.
(E) Heat generated by Sandactylus in
flapping its wings in flight could not have been dispersed by anything other
than the blood vessels in its wings.
答案及解释如下：
Reasoning What assumption does this argument make? The networks of blood vessels in the wings of bats are shown to have
a purpose: to disperse the heat generated by wing-flapping flight. In proposing
that a similar structure had a similar purpose in Sandactylus, the argument
assumes that the network of blood vessels found in the dinosaur wings had a
purpose.
A Correct. This statement properly
identifies the assumption that underlies the argument: there was a purpose for
the network of blood vessels found in the wings of Sandactylus.
B This
statement is too broad to be assumed; the comparison between bats and
Sandactylus cannot be extended to all flying creatures.
C No
conclusion is drawn about the efficiency of flight, so this point is not
assumed.
D The
argument does not assume that evidence is certain to be found.
E Since
this point is not addressed in the argument, it cannot be assumed.
The correct answer is
A
我觉得，按照原题中的结论，潜在的假设是Sandactylus的翅膀里的血管和bat的存在理由是一样的，都是为了能排出挥动翅膀产生的热量。
感觉ets给出的reasoning中的红色部分说的不是很明确啊。。。
能排除B到E，但是觉得A不是很让人信服啊……
请指教下~~~~~
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发表于 2008-8-15 21:05:00
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