有如下程序：
#include<stdio.h>
main()
{
char a[30],b[30];
scanf("%s",a);
gets(b);
printf("%s\n %s\n",a,b);
}
程序运行时若输入：
how are you? I am fine〈回车〉
则输出成果是（ ）
how are you? I am fine are you?
how? I am fine
how are you? I am fine
row are you?