No direct evidence is provided to show that it is the home schooling that resulted in the higher grades of students who received it.

　　The fact that the grade differences disappeared in the second semester might well illustrate that home schooling was not responsible for the higher grades.

　　The author ignores other better ways to educate teenage children.

　　The author assumes without any guarantee that the incentives will be effective and most parents are willing to respond to the policy.

　　The author fails to consider if some parents are capable of being effective tutors, merely more attention does not equal better education.

　　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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