【正确答案】 A

【答案解析】[解析] 句意：医院同意免费护理那些低收入者。A选项是those，代指那些人。英语中，one、ones、that、those常用作代词，指代前面出现过的名词以避免重复，确保句子的简洁。故A正确。 1．those用来指代“同名异物”的可数名词复数。 e.g.：(1)The houses of the rich are generally larger than those of the poor. (those=the houses)富人的房子通常都比穷人的大。 (2)The bikes made in China are as good as those made in USA. (those=the bikes)中国制造的自行车和美国制造的一样好。 2．ones用来指代“同名异物”的可数名词复数。 e.g.：(1)—Do you want a toy?你想要个玩具吗? —Yes, I want new ones very much. (ones=toys)是的，我非常想要新的玩具。 (2)Stone bridges last longer than wooden ones. (ones=bridges)石桥比木桥保存的时间更长。 (3)Teachers like the students working hard, especially the ones who are active in thinking. (the ones=the students)老师喜欢努力学习的学生，尤其喜欢那些积极思考的学生。