焦炭在高炉冶炼过程中起（）作用。
A、还原剂
B、发热剂
C、支撑炉料
D、氧化剂
参考答案：A, B, C
一个正多边形的每个外角为15°，则这个正多边形的边数为 ．
Everyone wants to win. But _____ me, the most important thing is to learn something new and have fun.
A．as for
B．thanks to
C．instead of
D．such as
