I think you should not buy clothes___________ animals fur.    [ ]

A. made of      

B. be made of    

C. making of    

D. is made of

景观艺术设计是对景观设计的更高要求，它以（）的设计方法为基础对景观设计进行研究，对景观设计过程中的处理提出要求。