The author falsely assumes that there were sufficient amount of comets striking the earth at the critical stage of ocean formation.
The authors assumptions that the Earths surface had already cooled and solidified when strikes by comets occurred, and that the heat generated during the striking was enough for all the comets to vaporize are unwarranted.
No evidence could ensure that ice contained in comets could have formed the water in Earths oceans, it may also evaporated, or diffused in the space.
The author fails to take into account other possible explanation for the origination of ocean water.
注:题目中括号里的数字表明这句话体现的是提纲中第几号缺陷。
无论是gre issue还是gre argument,考生都应该养成写提纲的习惯。这种提纲式的gre写作练习可以帮助考生锻炼写作的逻辑性,而gre写作高分最重要的得分依据就是作文的逻辑性要强。
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