GRE作文新增的argument题目(2)_GRE写作

GRE作文新增的argument题目(2)

　　from a draft textbook manuscript submitted to a publisher.

　　as earth was being formed out of the collision of space rocks, the heat from those collisions and from the increasing gravitational energy of the planet made the entire planet molten, even the surface. any water present would have evaporated and gone off into space. as the planet approached its current size, however, its gravitation became strong enough to hold gases and water vapor around it as an atmosphere. because comets are largely ice made up of frozen water and gases, a comet striking earth then would have vaporized. the resulting water vapor would have been retained in the atmosphere, eventually falling as rain on the cooled and solidified surface of earth. therefore, the water in earths oceans must have originated from comets.

　　the following appeared in a medical newsletter.

　　doctors have long suspected that secondary infections may keep some patients from healing quickly after severe muscle strain. this hypothesis has now been proved by preliminary results of a study of two groups of patients. the first group of patients, all being treated for muscle injuries by dr. newland, a doctor who specializes in sports medicine, took antibiotics regularly throughout their treatment. their recuperation time was, on average, 40 percent quicker than typically expected. patients in the second group, all being treated by dr. alton, a general physician, were given sugar pills, although the patients believed they were taking antibiotics. their average recuperation time was not significantly reduced. therefore, all patients who are diagnosed with muscle strain would be well advised to take antibiotics as part of their treatment.