难易程度：★★★★
题目题材：社会
gre argument 159题目：
The nation of Claria covers a vast physical area. But despite wide geographic differences, many(1) citizens are experiencing rising costs of electricity. A recent study of household electric costs in Claria found that families who cooled their houses with fans alone spent more on electricity than did families using air conditioners alone for cooling. However, those households that reported using both fans and air conditioners spent less(3) on electricity than those households that used either fans or air conditioners alone(2). Thus, the citizens of Claria should follow the study's recommendation and use both air conditioners and fans in order to save money on electricity(4).
提纲：
(1)The author does not point out what fraction of citizens of Claria experienced rising costs of electricity.
(2)The argument does not consider other possible differences between these groups of families, e.g. the cost of electricity, geographical factors, etc.
(3)The author fails to establish a causal relationship between using both appliances simultaneously and the lower expenditure on electricity.
(4)The author unfairly assumes that the proposed action is both sufficient and necessarily for saving money on electricity.
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。希望大家都能写出好作文。
