第31题: [单项选择]The aim of the U.S. government in imposing rent controls on American cities in 1943 was to help ______. A. workers and the families of soldiers B. low-income families C. up-middle-income families D. high-income families 参考答案:A 答案解析:根据第三段第一句话“Rent control in the United States began…help workers and the families of soldiers during W