[求助]大全-19-6 and 大全-19-13

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.（A）

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

The key is A

整题的考点和句意都看不是很懂，麻烦高人指点一下？

13. Investigator: XYZ Coins has misled its clients by promoting some coins as “extremely rare” when in fact those coins are relatively common and readily available.

XYZ agent: That is ridiculous. XYZ Coins is one of the largest coin dealers in the world. We authenticate the coins we sell through a nationally recognized firm and operate a licensed coin dealership.

The XYZ agent’s reply is most vulnerable to the criticism that it

(A) exaggerates the investigator’s a claims in order to make them appear absurd

(B) accuses the investigator of bias but presents no evidence to support that accusation

(C) fails to establish that other coin dealers do not also authenticate the coins those dealers sell

(D) lists strengths of XYZ Coins while failing to address the investigator’s charge（D）

(E) provides no definition for the inherently vague phrase “extremely rare”

the key is D

请问E 是什么意思，错在哪里？

先谢谢大家啰

6. 原文的意思，nerve cell不会regenerate，是因为有种inhibitor抑制了growth.

Choice A 认为这种抑制效果只是一种by product, 也就是说，如果把这种inhibitor干掉的话，会引起其他的后果。 那么谁敢把这种手段作为standard medical procedure 呢？

13. Choice E说agent 没有给extremely rare做个明确定义。不过很明显, agent最大的错误在于Choice D.

    6。原文推理过程：1）抗体可将神经生长抑制因子反应导致神经生长抑制因子失活，2）神经生长抑制因子导致损伤的神经不能修复——》不久以后神经修复将可行

    问削弱：A说神经生长抑制因子在人体内功能的副产品是导致受损神经不能修饰，也就是说，神经生长抑制因子还有其他功能。因此，如果用抗体使神经生长抑制因子失活，那么它的其他功能也被抑制，医学上就不能这样做。所以削弱

   13题我认为是个阅读问题，读懂文章了，选项没有任何难度。E说没给“extremely rare”下定义，显然错。agent根本就是答非所问

这题的推理缺陷在于agent的回答和invesigator推理没有什么关系。

B其实是无关的选项。因为agent说的是个事实，不需要什么证据支持～～～

个人观点～～～

可以这么说吧～～～

investigator’s charge是什么意思？