题目

 — Why do you stay at home? It’s time for you to go to the airport now. — Mum, it’s unnecessary to go there. The plane has been ____ because of the thick smog.      A. handed out         B. put off            C. cleaned up                 D. given away     答案：B下图是我国第六次人口普查的有关结果,从普查结果分析看,说法正确的是( )①我国人口增长速度加快 ②人口老龄化加重(60岁以上人口占总人口的比例)③居民受教育程度提高 ④城镇人口比重大于乡村人口比重A.①③ B.②③ C.③④ D.①④