GRE考试形式：中国大陆地区、香港、澳门、韩国目前执行分开考试的形式。由机考（分析性写作）和笔试（语文、数学）组成。
Finally, the speaker's grave prediction relies on the assumption that the ozone-thinning
process will not reverse in the future. Although this assumption might be born out, on the other
hand it might not. Without providing some assurance that the ozone layer will at least continue
to be as thin as it is now, the speaker cannot convince me that other species will experience a
population decline as a result of radiation damage to eggs.
In sum, the speaker's argument depends on a series of doubtful assumptions, and is
therefore weak. To strengthen it the speaker must supply better evidence that the total
salamander population is declining, and must rule out all other possible explanations for that
decline. The speaker must also provide clear evidence that the current level of radiation
reaching the surface is as potentially damaging to the eggs of other species, and must account
for why other species have not already experienced a declining population. Finally, to better
assess the argument I would need a reliable prognosis for the Earth's ozone layer.
Argument 93
The following appeared in a memorandum from the planning department of an electric power
company.
"Several recent surveys indicate that homeowners are increasingly eager to conserve energy
and manufacturers are now marketing many home appliances, such as refrigerators and air
conditioners, that are almost twice as energy-efficient as those sold a decade ago. Also, new
technologies for better home insulation and passive solar heating are readily available to
reduce the energy needed for home heating. Therefore, we anticipate that the total demand for
electricity in our area will not increase, and may decline slightly. Since our three electric
generating plants in operation for the past 20 years have always met our needs, construction
243
of new generating plants should not be necessary."
The author of this memo concludes that there is no need for an additional electric power
plant in the area because total electricity demand in the area is not likely to increase in the
future. To support this conclusion the author cites the availability of new energy-efficient
appliances and systems for homes, and the eagerness of area homeowners to conserve
energy. However, the argument relies on several doubtful assumptions, and is therefore
unpersuasive as it stands.
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