【正确答案】:
DID YOU KNOW, FOR EXAMPLE, THAT THE BACKPACKS THAT SO MANY STUDENTS CARRY TODAY WERE ORIGINALLY DESIGNED FOR THE MILITARY? 
【题目解析】:本题考点:疑问句的句序调整
DID YOU KNOW, FOR EXAMPLE, THAT THE BACKPACKS THAT SO MANY STUDENTS CARRY TODAY WERE ORIGINALLY DESIGNED FOR THE MILITARY?