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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.（A）
(E) Deactivating the substances inhibiting nerve growth for an extended period would require a steady supply of antibodies.
这题选A还是没有看懂，这道题如何说明inhibors主要功能并不是阻碍神经重生，它还有其它更重要的作用。如果使ngi失去活力了，它其它的功能无法完成，
我知道CD上有这题，但是不知道为什么回复了顶不上去，所以就自己发帖求解算啦。希望大家帮忙。这题想了很久.我选了B |
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发表于 2010-7-4 23:01:34
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