He would rather ____a volunteer in Yushu than      in Beijing University.  [ ]

  A. be; teach       

  B. to be; teach    

  C. being; teaching    

  D. is; teach

泡茶时应根据茶的种类选用不同的茶具，其中花茶应选用较大的瓷壶，乌龙茶宜选用紫砂茶壶