another cr
Damages nerves in the spine do not regenerate themselves,nor even under the spur of nerve-growth stimulants.The reason is the presence of nerve-growth inhibitors in the spine. Antibodies that deactivate the inhibitors have now been developed. Clearly, the nerve repair will be a standard medical procedure in future.
Which one weakens the conclusion?
a Prevention of nerve regeneration is only a by-product of the main function in the human body of the substances inhibiting nerve growth.
b Certain nerve-growth stimulants have the similar chemical structures to those of the antibodies against nerve-growth inhibitors.
Which one is better?????
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讨论中A、B选的都有，但我认为答案应是b
because stimulants have the similar chemical structures to those of the antibodies ,then inhibitors may inhibit antibodies.
不过不是很SURE
如果B 选项为 Certain nerve-growth stimulants have the similar chemical structures to those of the nerve-growth inhibitors.
我就蛮确定B了
because Antibodies will deactivate the nerve-growth stimulants
because of the similar chemical structures
ur opinion?[em19][em19]作者: tongxun 时间: 2002-6-21 23:18
选项应该是A。因为A直接削弱了结论（be a standard medical procedure ）。若only a by-product of the main function ，你若将它拮抗了，对机体的危害就大了，那怎么还能作为standard medical procedure 呢？作者: oncemore 时间: 2002-6-22 15:24
同意楼上的看法
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