A:40°
B:50°
C:60°
D:70°
如图所示四个图形中,能用∠α、∠AOB、∠O三种方法表示同一个角的图形是( )
唐太宗吸取“隋炀帝暴虐,臣下钳口(闭口不说话),卒令不闻其过,遂至灭亡”教训,注重( )
In April, the weather in some places in Shanxi was really changeable. People still remember they have _______ four seasons in a week.