6．設(shè)int a=2,b=3,x,y;,則能正確執(zhí)行的語句是（　　�。�

A．scanf(〞%d,%d〞,x-y,x+y);                         B．printf(〞%d\n〞,a%b);

C．printf(〞%f\n〞,a+b);                                  D．scanf(〞%d,%d〞,x,y);

7．設(shè)char s[10]= 〞abcde〞,t[ ]= 〞12345〞; ,則s和t在內(nèi)存中分配的字節(jié)數(shù)分別是（　　�。�

A．6和5                                                         B．6和6

C．10和5                                                       D．10和6

8．設(shè)int a=10,*p=&a; ,則執(zhí)行printf(〝%d\n〞,*p+a);的結(jié)果是（　　　）

A．10                                                              B．20

C．30                                                              D．40

9．自定義函數(shù)中形式參數(shù)的作用域是（　　�。�

A．本文件                                                       B．本函數(shù)

C．main 函數(shù)                                                  D．整個程序

10．設(shè)int b[ ][5]={1,2,3,4,5,6,7}；，則元素b[1][2]的值是（　　�。�

A．0                                                                B．2

C．6                                                                D．7