[求助]11thOG-89

OG(11)-89

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 lapping 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.

答案是(A)>>

想请教为什么(E)不是答案呢? 取非同样削弱原文啊!!

谢谢了!!

我觉得是这样的：

Networks of blood vessels in bats' wings serve only to
disperse heat generated in flight.蝙蝠的网状血管只用来飞行散热，因为飞行中要拍击翅膀。

dinosaur Sandactylus 有同样的网状血管

得出结论：

Sandactylus flew by flapping its wings, not just by gliding.

这个恐龙飞行靠拍击翅膀，而不是滑行。

这个结论根事实间有个gap，就是：所有的有这个血管的东西都是象鸟一样拍击翅膀，而且都靠这个来散热。

b） All creatures that fly by flapping their wings have networks of blood vessels in the skin of their wings.正确。

而e说，恐龙拍翅膀只靠血管来散热。直接就说恐龙在拍翅膀了，只见的gap还是存在，可以算是无关的。

请指教。

不过你的思路我好象明白了,谢谢啦!!

Let me try .

Logic of the passage:networks of blood vessel ->fly by flapping

Confusing choices:

B.  fly by flapping-> networks of blood vessel 逆命题不能作为假设.

B should be changed as below to be right.

All creature that have networks of blood vessel must fly by flapping.

A simply state that networks of blood vessel have a purpose , so it must be true if the revised B above is true.

E.flapping the wing is the conclusionof the reasoning.  

You can't assume the conclusion.

A will be easier if changed as below:

S would not have had networks of blood vessels if there networks were not

used to disperse heat by S when flapping.

这个对B排除得很好，我当时就选了B，呵呵。

Let's Fight,
Demon Hunter

我觉得是不是可以这样理解,题目中的结论是:S的similar blood network只是为假设--S不仅仅是gliding(也flaping)提供evidence,那么题目就可以看成是network 支持flaping的一个假设条件是什么,而E取非后,Heat generated by Sandactylus in flapping its wings in flight could have been dispersed by anything other than the blood vessels in its wings.这个取非不能对network不支持flaping产生任何威胁,因为即使可以通过其他方式散热,network也有可能支持flapping.

说的我自己都晕了,大家继续讨论plz

问个很古老的问题, 假设题中,对于选项取非该如何做,比如此题, 是仅仅主语的谓语动词取非还是主句和从句的谓语都取非.??

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