转炉炼钢法中为调整温度，可加入的材料为( )。
A．石灰
B．废钢
C．冷生铁块
D．铁水
E．矿石
参考答案：B,C,D
The father as well as his three children _____ skating on the frozen river every Sunday
afternoon in winter. [ ]
A. is going
B. go
C. goes
D. are going
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