It is ______for him to get to school on time, because it is raining ______.
写出如图的符合下列条件的角.(图中所有的角均指小于平角的角).
(1)能用一个大写字母表示的角;
(2)以点A为顶点的角.
①人口总量不断增加
②计划生育取得成效
③人口自然增长率下降
④老龄化同题日益严重