A:(0,-2)
B:(0,0)
C:(-2,0)
D:(0,4)
Where _____ they go yesterday ?
①abc<0;②b2﹣4ac>0;③3a+c<0;④16a+4b+c>0.
其中正确结论的个数是( )
I have the ____of reading before sleeping. It has been part of my life.