No direct evidence is provided to demonstrate that exposure to bacteria does lead to proper development of the immune system.
The author fails to provide proper information about the incidence of allergies of the two groups of children when they grow up.
Limiting childrens exposure to dangerous irritants or bacteria to some extent would still be necessary.
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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