符合（）要求的生铁产量占高炉总产量的百分数叫生铁合格率。
A.炼钢标准
B.国家标准
C.铸造标准
参考答案：B
I hear Mr Brown lives here, but I’m not sure .
A．he lives in which room
B．which room does he live in
C．which room he lives in
D．in which room does he live
厨房中的下列物质，与水混合一般不能形成溶液的是 [ ]
A．植物油
B．食盐
C．白糖
D．食醋
