请在下方横线上填入正确的语句,使得程序可以正常执行。 ____ = input（）

程序补丁题：请在横线上填写正确的语句。 1、下列程序的功能是把从键盘输入的整数取绝对值后输出。 #include <stdio.h> int main(void) { int x; printf("please input x:\n"); scanf("%d”, ); if(x<0) ; printf("%d\n", ); return 0; } 2、下列程序的功能是从输入的整数中，统计大于零的整数个数和小于零的整数个数。用输入0来结束输入，用i,j来放统计数，请填空完成程序。 　　 void main() { n,i="0,j=0;" printf(“input a integer,0 for end\n”); scanf(“%d”,&n); while ( ) if(n>0) ; else j=j+1; } printf(“i=%4d,j=%4d\n”,i,j); } 3.从键盘上输入一个百分制成绩score，按下列原则输出其等级：score≥90，等级为A；80≤score<90，等级为b；70≤score<80，等级为c；60≤score<70，等级为d；score<60，等级为e。 #include> void main(){ int data; char grade; printf("Please enter the score:"); scanf("%d”, &data); switch( ) { case 10: case 9 : grade= ; break; case 8: grade=’B’; break; case 7: grade=’C’; break; case 6: grade=’D’; ； default: grade=’E’; } printf("the grade is %c”, ); }

B.privateA

C.protectedA

D.virtualpublicA

A．There are considerable national gains that arise from trade because there is an increase in the number of varieties of products available in the country．

B．Domestic consumers gain because such trade results in lower prices of domestic varieties of the gooD

C．Total output of the domestic firms in the industry increases as a result of such trade

D．There are few shifts in production between industries that put pressures on factor prices．