A.By watching some films about World Environment Day. B.By listening to some lectures and planting trees, etc. C.By planting trees, having some green concerts, bicycle parades, etc. D.By delivering some speeches about World Environment Day.
【单选题】下列程序执行后输出的结果是: int f(int a) { int b=0;static c=3; a=c++,b++; return (a); } void main() { int a=2,i,k; for (i=0;i<2;i++) k=f(a++); printf(“%d\n”,k); }