题目

．—Why are the housing prices in big cities going up all the time?        —One reason is that people are________into overcrowded cities in great numbers.        A．breaking   B．filling       C．pouring    D．hurrying 答案：C南极洲有“寒极”之称，以冰原气候为主，其气候酷寒的主要原因是(　 　) ①跨经度最广　②地处高纬　③绝大部分被冰雪覆盖　④受海洋影响大A. ①② B. ③④ C. ①④ D. ②③