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GRE作文入门和进阶九 The correlation of the high irons level and heart disease the arguer trying to prove is not as perfect as he assumes. Although at first glance， his cause-and-effect analysis seems quite cogent， yet it cant stand much reexamination. I agree to the well-established theory concerning the necessary relation between the large amount of red meat in peoples diet and heart disease， but no other possibilities can be ruled out except for one of the ingredients-iron. It is obvious that the arguer constructs his building of conclusion on the basis of the conviction of the deleterious function stems from the iron. While not only a single iron does red meat contain， as we all know， many other components also have the influential role once being indigested into human body. For instance， some type of particular protein it might include， instead of the iron， is the substantial root of heart attack. So the arguers peroration has no convincing power for this gratuitous assumption. Moreover， even though his deduction does really derive from some passage of authoritative researches he has no opportunity to list below， the assertion about the high levels of iron related to the possibility of heart disease cannot be got through by merely so qualified the evidence exhibited here. According to the arguers elicitation， we believe the red meat does contain large amount of iron， however， we might ask ourselves such questions enlightened by our common sense， Does the amount of iron involved in red meat reach the dangerous level enough to lead to heart disease? The answer we cant obtain through this short argument， thus directly make us doubt the whole fruits the arguer attained. | 
