我国的大城市主要分布在[ ]
A．第一级阶梯上
B．第二级阶梯上
C．第三级阶梯上
D．第一、二级阶梯上
答案：C
Health is very important to us. We should eat more vegetables and fruit instead of ___ rich food. [ ]
A. too much
B. much too
C. very much
D. too many
宪法规定中华人民共和国的根本制度是( )制度。
A．人民民主专政B．社会主义C．党的领导D．公有制
