GRE写作成为横在中国学生的理想和现实之间的一大障碍，因此，如何攻克写作这道屏障，成为摆在我们面前的首要任务。
Secondly, the letter's conclusion relies on the assumption that one additional hour of sleep
would in fact result in improved academic performance. While this might be the case, the letter
provides no evidence to substantiate this assumption. It is entirely possible that one hour of
additional sleep would not suffice. Moreover, the letter provides no evidence that the students
who are dissatisfied with their academic performance are also the ones who would benefit
217
from the new schedule. It is entirely possible that these particular students already sleep
longer than most other students, or that their academic performance is already optimal.
Conversely, it is entirely possible that those students whose academic performance could
stand the greatest improvement would be unmotivated to become better students regardless
of how much they sleep each night.
A final problem with the argument involves the two studies themselves. The letter pro vides
no information about how either study was conducted. Without knowing whether the sample of
adolescents studied was representative of the overall high school population in the city, it is
impossible to confidently apply the studies' results to that population. Moreover, we are not
informed about the size of the sample in either study; the smaller the sample, the less reliable
the study's conclusion.
In conclusion, this letter's recommendation for beginning and ending the high school day
one hour later is not well justified. To strengthen the argument, the author must provide clear
evidence that adjusting the schedule will in fact result in the students' sleeping longer each
night, and that this additional sleep will in fact improve their academic performance. To better
assess the author's recommendation, we would need more information about the sampling
method used in the two studies.
Argument 70
Butter has now been replaced by margarine in Happy Pancake House restaurants throughout
the southwestern United States. Only about 2 percent of customers have complained,
indicating that 98 people out of 100 are happy with the change. Furthermore, many servers
have reported that a number of customers who still ask for butter do not complain when they
are given margarine instead. Clearly, either these customers cannot distinguish margarine
from butter, or they use the term "butter" to refer to either butter or margarine. Thus, to avoid
the expense of purchasing butter, the Happy Pancake House should extend this cost-saving
change to its restaurants in the southeast and northeast as well.
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