题目

 有关人口与经济，正确的叙述是(   ) A.我国人口众多，对于发展我国经济百害无益 B.我国众多的人口为社会经济的发展作出巨大贡献，使我国各项经济指标均名列世界前列 C.孩子过多，只会给家庭经济带来困难，不会给国家的经济发展增加负担 D.我国人民每年所创造的社会财富，有较大一部分都消耗于每年新增加人口的需求上 Out of the crowded bus ________, who was dressed in a black suit and waved to a woman． [　　] A． a tall man in his thirties stepped B． stepped a tall man in his thirties C． did a tall man in his thirties step D． did a tall man step in his thirties