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为了方便手上没有11版OG的朋友对此题的分析，现将OG的原题与分析一并给出。希望大家帮帮忙，实在是混惑很就了！ 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. Argument Construction Situation The network of blood vessels in bats' wings is compared with a similar structure in the wings of the dinosaur Sandactylus to explain how the dinosaur flew. (The same as the previous item.) 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 cannotbe assumed. The correct answer is A. 尤其是E选项，请大家关注一下！ 拜托  
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发表于 2006-10-20 08:44:00
