请教大全-19-6

swiffer

6.     Damaged nerves in the spinal cord do not regenerate themselves naturally, nor even under the spur of nerve-growth stimulants. The reason, recently discovered, is the presence of nerve-growth inhibitors in the spinal cord. Antibodies that deactivate those inhibitors have now been developed. Clearly, then, nerve repair will be a standard medical procedure in the foreseeable future.

Which of the following, if true, casts the most serious doubt on the accuracy of the prediction above?

(A) Prevention of the regeneration of damaged nerves is merely a by-product of the main function in the human body of the substances inhibiting nerve growth.

(B) Certain nerve-growth stimulants have similar chemical structures to those of the antibodies against nerve-growth inhibitors.

(C) Nerves in the brain are similar to nerves in the spinal cord in their inability to regenerate themselves naturally.

(D) Researchers have been able to stimulate the growth of nerves not located in the spinal cord by using only nerve-growth stimulants

(E) Deactivating the substances inhibiting nerve growth for an extended period would require a steady supply of antibodies.

答案选A，我觉得应该选B。请指点迷津。

叮当

B 说 SIMILAR 但不是SAME

A 说 "Prevention of the regeneration of damaged nerves is merely a by-product ", 说明此"nerve-growth inhibitors" 还有其他更多的作用. "deactivate those inhibitors" 可能导致其它的副作用.

[此贴子已经被作者于2004-5-17 21:54:28编辑过]

swiffer

但是选A的话，从"Prevention of the regeneration of damaged nerves is merely a by-product "得到不能实现“nerve repair will be a standard medical procedure in the foreseeable future”的结论必须基于一个假设，即："deactivate those inhibitors" 对身体有害，而不是有益。

而B的assumption为：与antibodies against nerve-growth inhibitors 有相似化学结构的nerve-growth stimulants有与antibodies相似的作用。

我觉得还是B的gap比较小，你觉得呢？

tqbiao

i think b not weaken but supports the conclusion.

b tells us that certain n-g stimulants not only can stimulate nerve to growth but also prove n-g inhibitors from inhibiting the n-g  to growth.

therefore b suppots the conclusion.

rosebudxiaojie

我认为B不是加强但是违反了白痴原则， 因为similar chemial structure 并不意味着相似的作用

xjlv128

同意叮当，B不是same,所以不会影响accuracy.

但是A，只是一个by-product，那么肯定会影响到main function，所以不accurate

raikey

我觉得毛病出在"nerve repair will be a standard medical procedure in the foreseeable future."这个结论里.

nerve repair未必特指"使用nerve-growth inhibitors",只要存在修复神经的方法(不论什么方法,也不论有多少种方法), 那么"神经修复"就会成为一个标准的医疗过程.

于是B就无法削弱结论. 因为就算有一种stimulant与nerve-growth inhibitor具有相同作用,也无法阻止"神经修复"成为标准过程,只不过是多了一种实现方法而已.
A就不同了,它直接置疑nerve-growth inhibitor的作用机理, 欲否定掉"神经修复"的唯一理论依据. 如果nerve-growth inhibitor有坏的作用,那么就算有作用类似的stimulator,也无法使"神经修复"成为一种可行的过程,更谈不上标准了.

wlcheer

大全-19-6.      Damaged nerves in the spinal cord do not regenerate themselves naturally, nor even under the spur of nerve-growth stimulants. The reason, recently discovered, is the presence of nerve-growth inhibitors in the spinal cord. Antibodies that deactivate those inhibitors have now been developed. Clearly, then, nerve repair will be a standard medical procedure in the foreseeable future. （procedure 不会因为antibody成功）

Which of the following, if true, casts the most serious doubt on the accuracy of the prediction above?

(A) Prevention of the regeneration of damaged nerves is merely a by-product of the main function in the human body of the substances inhibiting nerve growth.  阻止破坏了的神经系统再生只是这个物质阻止神经生长个一个副作用

(B) Certain nerve-growth stimulants have similar chemical structures to those of the antibodies against nerve-growth inhibitors.   有些刺激物和antibody有同样的结构。（弱支持）

(C) Nerves in the brain are similar to nerves in the spinal cord in their inability to regenerate themselves naturally.       （在脑中，nerves和在脊髓中一样，不能重生，无关）

(D) Researchers have been able to stimulate the growth of nerves not located in the spinal cord by using only nerve-growth stimulants.（A） （在其他地方获得成功，无关或弱支持）

(E) Deactivating the substances inhibiting nerve growth for an extended period would require a steady supply of antibodies. （使失活要一定量的的antibody）

agnesliu

A因为抑制神经细胞再生只是inhibitors的一个副作用，那么它到底还有什么作用是未知的，采取去掉inhibitors的治疗方法有不可预知的后果，目前用于医疗过程风险太大
削弱了结论nerve repair will be a standard medical procedure in the foreseeable future，即是否能成为标准的医疗过程是不可知的