有三个原因largely due to 1an increase in the deer population that occurred simultaneously with 2the growth of the suburbs 3and increased outdoor recreational activities in the deer's habitat B说室内recreation增加,时间对了可是不会 strengthen the author's assertion about the cause of the Lyme disease outbreak in the United States 原文说It occurred only sporadically during the late nineteenth century but has recently become prevalent in parts of the United States,这个recently就是 in the mid twentieth century五十年代后才有GMAT考试的,所以如果A对,就会strengthen the author's assertion
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