If city noises _____ from increasing, people _____   shout to be heard even at the dinner table

20 years    from now.  [ ]

A. are not kept;  will have to  

B. are not kept;  have to    

C. do not keep;  will have to  

D. do not keep;  have to

有以下程序：
main()
unsigned char a=2,b=4,c=5,d;
d=a|b; d＆=c; printf("%d\n",d);
程序运行后输出的结果是( )。

A．3
B．4
C．5
D．6