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编辑点评： 研习GRE作文考试的优秀范文不仅可以学到有用的词汇和句子，更能从中学习逻辑的构建方式和作文框架的结构等内容，本文是GRE作文考试Issue类型的范文，希望对同学们的备考有所帮助。 As people grow older, an enzyme known as PEP increasingly breaks down the neuropeptide chemicals involved in learning and memory. But now, researchers have found compounds that prevent PEP from breaking neuropeptides apart. In tests, these compounds almost completely restored lost memory in rats. The use of these compounds should be extended to students who have poor memory and difficulty in concentrating-and therefore serious problems in school performance. Science finally has a solution for problems neither parents nor teachers could solve. In this argument, the arguer states that researchers have found compounds that keep an enzyme known as PEP from breaking neuropeptides apart, which are known to be involved in learning and memory. The arguer states that tests have shown that these compounds almost completely restored lost memory in rats, and that therefore, these compounds should be administered to students with poor memory and difficulty in concentrating. This argument is unconvincing because it contains several critical flaws in logic. First of all, the arguer states that as people grow older, PEP breaks down the neuropeptide chemicals that are involved in learning and memory. It is true that generally, as people get older, they tend to have more problems with learning and memory. However, there is no direct link mentioned between the breaking down of the neuropeptide chemicals and the loss of learning ability or memory. Additionally, the arguer mentions neuropeptide chemicals that are broken down by PEP. What the researchers have found is a compound that prevents neuropeptides from breaking apart. These are two different physical actions: the breaking down of neuropeptide chemicals as opposed to the breaking apart of the neuropeptides themselves. Furthermore, it is not stated which of these physical actions is involved with the loss of learning ability and memory. It is not explicitly stated that the breaking down of chemicals causes a loss in learning ability and memory, only that this happens as people grow older. It is also not expressly stated whether the breaking apart of the neuropeptides themselves causes memory loss or a lessened learning ability. Without showing a direct link between the effect of keeping the neuropeptides from breaking apart and a reduction in the loss of memory and learning ability, the efficacy of the compounds is called into question. | 
