句型转换。

1.They spent 3 hours planting the trees.（改为同义句）    

It         them 3 hours                  the trees.

2.I'm allowed to buy books once a week. ( 对画线部分提问)    

                 are you allowed to buy books?

3.He can finish the work in two days.  (改为被动语态)    

The work                            in two days.

4.I think you should choose your own clothes.    

I                   you should choose your own clothes.

5.My parents allow me to go to the movies on weekends.  (对画线部分提问)

                 your parents allow you to           on weekends?

（）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