Which is true about prostate （）.

A．sup. extremity is apex, and inf. extremity is base

B．lies between the urinary bladder and the rectum

C．the posterior surface has a transverse groove

D．male urethra and ejaculatory ducts pass through it

E．ductus deferens pass through it

有以下程序： main() {int num[4][4]={{1,2,3,4},{5,6,7,8},{9,10,11,12},{13,14,15,16}},ij; for(i=0;i＜4;i++) { for(j=0;j＜=i;j++) printf("%4c",’’);for(j=【 】;j＜4;j++) printf("%4d",num[i][j]);printf("\n"); } } 若要按以下形式输出数组右上半三角 1234678 11 12 16 则在程序下划线处应填入的是【 】。

A．i-1

B．i

C．i+1

D．4-i