下列化合物分子中的所有原子一定都处于同一平面的是( )
A:乙醇
B:甲苯
C:四氟乙烯
D:丙烯
I ____ (make) a birthday cake for my mother last Sunday.
亚洲与北美洲的洲界线、俄罗斯与美国的国界线和国际日期变更线,“三线”穿过的海峡是()
—Why can't you give me another chance?
—________, but I don't think you are good at management.