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TOPIC: ARGUMENT71 - Copper occurs in nature mixed with other minerals and valuable metals in ore, and the proportion of copper in the ore can vary considerably. Until fairly recently, the only way to extract pure copper from ore was by using a process that requires large amounts of electric energy, especially if the proportion of copper in the ore is low. New copper-extracting technologies can use up to 40 percent less electricity than the older method to process the same amount of raw ore, especially when the proportion of copper in the ore is high. Therefore, we can expect the amount of electricity used by the copper-extraction industry to decline significantly.
A: 不能证明省电1:等量矿石不等于等量铜含量
B: 不能证明省电2:不清楚新方法对铜含量少的铜提纯的作用
C: 即使省电,不一定被广泛应用,而且可能导致铜提纯工业大兴
留链接,有拍必回
The argument is unconvincing since the conclusion that the amount of electricity used by the copper-extraction industry would decline significantly bears no necessary correlation with the new copper-extraction technology.
Firstly, the assumption that the new method used less electricity than the older is ungrounded due to the flaw of the experiment. As the arguer cites, the proportion of copper in the ore can vary considerably. However, the experiment which shows the less electricity used by the new method, overlooks the influence of the proportion of copper. After all, the same amount of raw ore does not mean the same amount of copper, whereas the different proportion of copper would definitely affect the amount of using electricity. Perhaps the new method use up to 40 percent less electricity than the older but produce half amount of copper. Under this circumstance, the less electricity using the new method is not equal with economical than the older. Without ruling out the possible affect of different amount of copper, we can hardly draw the conclusion that the new method use less electricity the older.
Furthermore, the arguer fails to point out the affect on low proportion amount of copper in ore when using the new method. As the arguer cites, the new method “can use up to” 40 percent less electricity especially in high proportion amount of copper in ore. Thus we have not got any information about the effect on low proportion. If there is no remarkable effect on low proportion, how could we judge the affectivity of the new method on copper-extracting?
Finally, even though the new method is indeed effective on less electricity using, the arguer supposes that the new method is the only factor which influence the amount of electricity used by copper-extraction industry, overlooking other possible circumstances. First, we cannot ensure that the new method would be used widely in copper-extraction industry. Maybe the new technology is advanced that the workers have to spend more time on studying and practicing. Or else, the cost is another possible influential factor of using the new method. Perhaps the price of new equipments cost too much that most factories cannot afford. Second, even if the new method is used widely, maybe the copper industry would develop. More factories started to produce copper, thus the productivity of copper is higher and higher. Accord with it, the amount of electricity used by copper-extraction industry would increase definitely. Therefore, even if the new method does use less electricity than the older, the conclusion that the amount of electricity used by copper-extraction industry would decline is still unpersuasive.
In sum, the argument is based on an unreliable experimental, and overlooks other possible influential factors of amount of electricity used by copper-extraction industry, which leads the argument unconvincing. |
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