题目

—Sir,could you please put out your cigarette?This is a smoke-free(无烟的)school. —________. A.I’m sorry about this                                      B.No problem C.Sure,I’d love to                                             D.Never mind 答案：A人口数量过多产生的影响有A、人均收入增加 B、国防兵力不足C、人均资源增多 D、交通拥挤，住房紧张