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　　Prepare for the GMAT Exam-Test Prep Materials-GMAT 真题训练：Critical Reasoning

　　题目

　　A factory was trying out a new process for producing one of its products, with the goal of reducing production costs. A trial production run using the new process showed a fifteen percent reduction in costs compared with past performance using the standard process. The production managers therefore concluded that the new process did produce a cost savings.

　　Which of the following, if true, casts most doubt on the production managers' conclusion?

　　选项

　　A. In the cost reduction project that eventually led to the trial of the new process, production managers had initially been seeking cost reductions of fifty percent.

　　B. Analysis of the trial of the new process showed that the cost reduction during the trial was entirely attributable to a reduction in the number of finished products rejected by quality control.

　　C. While the trial was being conducted, production costs at the factory for a similar product, produced without benefit of the new process, also showed a fifteen percent reduction.

　　D. Although some of the factory's managers have been arguing that the product is outdated and ought to be redesigned, the use of the new production process does not involve any changes in the finished product.

　　E. Since the new process differs from the standard process only in the way in which the stages of production are organized and ordered, the cost of the materials used in the product is the same in both processes.

　　答案：C

　　解释：

　　The managers concluded that the new process produced a cost savings on the basis of a trial run of the process in which costs were 15 percent lower than they had been previously. You are asked to identify something that casts doubt on their conclusion.

　　Choice C is the best answer. If production costs at the factory fell for a similar product that was produced without using the new process, it is more doubtful that the observed production cost reductions achieved during the trial run were actually produced by the new process.

　　Choice A is incorrect; the fact that the managers had hoped for cost reduction of fifty percent does not cast any doubt on their conclusion that the new process had produced at least some savings. Choice B is incorrect since finding the source of the cost savings in the trial shows that the savings were no mere accident and so reinforces the managers' conclusion. Choices D and E are incorrect since by emphasizing that certain aspects of the product — its design and raw materials — were the same in the standard process and the new process, these two answer choices support, rather than cast doubt on, the conclusion that the process itself produced the savings.