当前文物市场价格坚挺，收藏热持续不衰，而文物的不可再生特点也是文物价格昂贵的原因之一，这其中包含的经济学原理是[ ]

A、供求关系影响价格

B、价值决定价格

C、价格影响供求关系

D、价格决定价值

句型转换。

1. They help plan the school leavers' party.(不改变原意)

    They help plan the school_________ _________ .

2. We intend to study abroad after graduation. (不改变原意)

    We intend_________ in_________ countries after graduation.

3. I decided to decorate my room. (不改变原意) 

    I _________ _________ _________ ________to decorate my room.

    I_________ _________ ________to decorate my room.

4. He has got ready for the final exam. (不改变原意) 

    He has_________ _________ the final exam.

5. Will you continue your study after graduation? (不改变原意) 

    Will you_________ _________ _________ your study after graduation?