I don't have a partner to practice English ______. [ ]
A. by
B. with
C. to
D. on
答案:B
元代杂剧的奠基人是( )。
A.关汉卿
B.马致远
C.王实甫
D.白朴
为明确诊断首选检查
A.腰穿化验脑脊液
B.MRI
C.脑血管造影
D.脑电图
E.气脑造影