GRE出国考试写作:GRE出国考试作文范例12

cal correlation. The presence or absence of other types of health problems is not mentioned in the study. It could be that there were other, perhaps not immediately noticeable health problems such as cancer affecting the people living near the sites. Additionally, the study appears to cover only one moment in time, or at least the duration of the study is not discussed. Perhaps there are long-term effects that cannot be discovered by a study conducted over a short period of time. This weakens the argument by leaving out information that could help to persuade the reader one way or another.

　　To add to the lack of credibility, the study does not discuss the relative size of the garbage sites or how close the homes and people were to the sites. There is really no data present to allow a proper decision to be made restricting the size of the sites or how close the homes could be located near the trash sites. At the very least, the fact that there is a slightly higher incidence of rashes in those living nearest the biggest trash sites indicates a need for further studies to prove or disprove the idea that trash sites of a certain size or location are health hazards.

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