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标题: XDF-S19-T6 , HELP [打印本页]

作者: isuffering 时间: 2003-9-27 14:50 标题: XDF-S19-T6 , HELP

6. Damaged nerves in the spinal cord do not regenerate
  themselves naturally, nor even under the spur of
  nerve-growth stimulants. The reason, recently dis-
  covered, 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.

The answer is A.

C, D, E is definitely wrong.

But I think B is tricky.

SINCE B SAYS,

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

AND WE KNOW THAT 药剂的化学结构相似功能作用相似，

THAT MEANS SO CALLED "nerve-growth stimulants" FUNCTION AS "nerve-growth inhibitors".

THUS B IS A GOOD WEAKEN.

SO CAN ANY NN TELL ME WHY CHOOSE A , NOT B?

THANKS IN ADVANCE.

作者: linsonstudy 时间: 2003-11-10 12:22

I think you misunderstanding what B means. B just tells that their chemical structures are similar rather than their functions. Similar structure doesn't mean similar function. The choice of B is designed to misguide you. B

Certain nerve-growth stimulants) ( those of the antibodies against nerve-growth inhibitors). After analyzing the sentence, its meaning is clear.

[此贴子已经被作者于2003-11-11 19:03:22编辑过]

作者: sunnyrain 时间: 2004-4-18 10:34

原来如此！

这道题我一直没搞明白

[此贴子已经被作者于2004-4-18 10:34:48编辑过]

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