后天考 着急！！

yunhaoll

Because ethylene dibromide, a chemical used to fumigate grain, was blamed for the high rate of nerve damage suffered by people who work in grain-processing plants, many such plants switched to other chemical fumigants two years ago.  Since then, however, the percentage of workers at these plants who were newly diagnosed with nerve damage has not dropped significantly.  Therefore, either ethylene dibromide was wrongly blamed or else the new chemicals also cause nerve damage.
                      C

 

Which of the following is an assumption on which the argument depends?

 

1. If the new chemicals cause nerve damage, the nerve damage caused would be different from any nerve damage that ethylene dibromide may cause.
2. There are no chemical fumigants that are completely safe for workers in grain-processing plants.
3. If ethylene dibromide causes nerve damage, it does not take two years or longer for that damage to become detectable.
4. Workers at grain-processing plants typically continue to work there even after being diagnosed with nerve damage.
5. Workers at grain-processing plants that still use ethylene dibromide continue to have a high rate of nerve damage.

 

大家能解释一下C的逻辑马

newyearagain

assuming that the new chemical doesnt cause nerve damage, If ethylene dibromide take two years or longer to make nerve damage to become detectable, we can conclude that  the fact that nerve damage has not dropped significantly is caused by ethylene dibromide only.

[此贴子已经被作者于2008-5-6 16:33:12编辑过]