GMAT考试写作指导：Argument范文一_GMAT写作

　　slow down once copper can be chemically synthesized. However, the author provides

　　no evidence to substantiate this assumption. Moreover, it is entirely possible that copper

　　mining will remain less expensive than copper synthesis. If so, there will be no

　　incentives, outside of regulatory ones, to slow down copper mining. In a word, the

　　problem of over-mining will remain.

　　Finally, the argument relies on the assumption that synthesizing copper will not

　　create the same kind of pollution problems as those resulting from the synthesis of

　　copper substitutes. However, the author provides no evidence to substantiate this

　　assumption. Without such evidence, we cannot accept the premise that pollution

　　problems will be eliminated by switching from producing copper substitutes to

　　producing copper itself.

　　in conclusion, I am not convinced on the basis of this argument that the time has

　　come to cut funding for the regulation of mining in general, or even for the regulation of

　　copper mining in particular. To strengthen the argument, the author must restrict the

　　scope of the conclusion to copper mining rather than to mining in general. The author

　　must also provide support for the two assumptions underlying the argument.

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