—Tom, why did you make no reply when I called your name in the street just now?—Sorry, Jim. I to my wife on the phone.
A:talked
B:am talking
C:was talking
D:had talked
二次函数y=ax2+bx+c(a≠0)的图象如图所示,下列结论:①b<0;②c>0;③a+c<b;④b2﹣4ac>0,其中正确的个数是( )
在数﹣2,3,﹣5,7中,最小的数是 ____