我国大型钢铁工业基地中位于长江流域的是[ ]
A．鞍山
B．马鞍山
C．唐山
D．包头
答案：B
Where _____ your Chinese teacher _____ ? [ ]
A. does; come from
B. is; come from
C. does; be from
D. is; comes from
脊神经的组成是（）
A.31对
B.28对
C.32对
D.30对
E.36对
