A:It's on 11th June.
B:It's on 1st June.
C:It's on 21st June.
----Tomorrow I'm going on holiday.
----- ! But I'll be busy.
消化系统是由____和____两部分组成.
若关于x的一元二次方程x2+2x+k=0有两个不相等的实数根,则k的取值范围是( )