The concentration of populations in cities has given ______ to many problems of housing, education, and medical services.
A、rise
B、reason
C、result
D、response
【正确答案】：A
【题目解析】：rise出现，give rise to使发生，引起；reason理由；result结果；response响应，，反应。句意：人口集中在城市导致了许多住房、教育和医疗服务的问题。
