A:The rising and setting(落下) of the sun and moon.
B:The change of spring, summer, autumn and winter of the year.
C:The change of the day and night.
D:The time in the east is earlier than that in the west.
下列各句中,划线成语使用正确的一项是 ( )
My bag is newer than _____.
已知a2﹣a﹣1=0,则a3﹣a2﹣a+2015=____