He worked hard before the college entrance examination, and it_________. His dream to go to college came true.  [ ]

A. showed off                

B. paid off    

C. put off                    

D. took off

（）就是利用多媒体，特别是超媒体技术，建立教学内容的结构化、动态化、形象化表示，不但包含文字和图形，还能呈现声音、录像、动画以及模拟的三维景象。

A.教材网络化

B.教材个性化

C.教材全球化

D.教材多媒化