87 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.
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.
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.
62. During the Second World War, about 375,000 civilians died in the United States and about 408,000 members of the United States armed forces died overseas. On the basis of those figures, it can be concluded that it was not much more dangerous to be overseas in the armed forces during the Second World War than it was to stay at home as a civilian.
Which of the following would reveal most clearly the absurdity of the conclusion drawn above?
(A) Counting deaths among members of the armed forces who served in the United States in addition to deaths among members of the armed forces serving overseas
(B) Expressing the difference between the numbers of deaths among civilians and members of the armed forces as a percentage of the total number of deaths
(C) Separating deaths caused by accidents during service in the armed forces from deaths caused by combat injuries
(D) Comparing death rates per thousand members of each group rather than comparing total numbers of deaths
E）Comparing deaths caused by accidents in the United States to deaths caused by combat in the armed forces
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发表于 2009-11-9 21:34:11
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