可知。]
11．attend/tend [信息转换题。根据文章最后一段第二句中的“older people can’t take care of themselves”可知。]
12．interest(s)/benefit(s) [信息转换题。根据文章最后一段第二句中的“the elderly are ungrateful and taking for themselves at the expense of children and other age groups”可知。]
13．discriminate [信息转换题。根据文章最后一段最后一句“Senior citizen discounts are the essence of the very thing older Americans are fighting against—discrimination by age.”可知。]
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